diff --git a/src/sass/2017/base/base.scss b/src/sass/2017/base/base.scss
deleted file mode 100644
index 10eec7518..000000000
--- a/src/sass/2017/base/base.scss
+++ /dev/null
@@ -1,68 +0,0 @@
-/*
- * Base
- */
-
-html,
-body {
-  background: $base-body;
-  font-family: $body-font;
-  font-size: 14px;
-  line-height: 1.6;
-  color: $base-text;
-  overflow-x: hidden;
-}
-
-body {
-  @include font-size(0);
-  padding: 0;
-  margin: 0;
-}
-
-/*
- * Code
- */
-
-pre,
-code {
-  font-family: $monospace-font;
-  letter-spacing: -0.03em;
-}
-
-pre {
-  font-size: $code-size;
-}
-
-/*
- * Antialias
- */
-
-*:not(pre):not(code) {
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-/*
- * Links
- */
-
-a {
-  color: $base-b;
-}
-
-a:visited {
-  color: $base-b7;
-}
-
-a:hover {
-  color: $base-b3;
-}
-
-// No tooltips on mobile
-@media (max-width: 580px) {
-  .hint--bottom {
-    &::before,
-    &::after {
-      display: none;
-    }
-  }
-}
diff --git a/src/sass/2017/components/attribute-peg.scss b/src/sass/2017/components/attribute-peg.scss
deleted file mode 100644
index c77b83fe3..000000000
--- a/src/sass/2017/components/attribute-peg.scss
+++ /dev/null
@@ -1,16 +0,0 @@
-.attribute-peg {
-  & {
-    display: inline-block;
-    height: 12px;
-    width: 20px;
-    text-align: center;
-  }
-
-  & > span {
-    display: inline-block;
-    width: 8px;
-    height: 8px;
-    background: saturate(lighten(#5a8, 16%), 24%);
-    border-radius: 50%;
-  }
-}
diff --git a/src/sass/2017/components/body-area.scss b/src/sass/2017/components/body-area.scss
deleted file mode 100644
index 2568f9b7e..000000000
--- a/src/sass/2017/components/body-area.scss
+++ /dev/null
@@ -1,9 +0,0 @@
-.body-area {
-  max-width: $area-width;
-  margin: 0 auto;
-  @include gutter(padding);
-
-  &.-slim {
-    max-width: 740px;
-  }
-}
diff --git a/src/sass/2017/components/site-header.scss b/src/sass/2017/components/site-header.scss
deleted file mode 100644
index 2ee0b47d6..000000000
--- a/src/sass/2017/components/site-header.scss
+++ /dev/null
@@ -1,44 +0,0 @@
-.site-header {
-  margin: 32px 0;
-
-  & > p {
-    margin: 0;
-    padding: 0;
-    text-align: center;
-    color: $base-mute;
-  }
-
-  & > p > a {
-    text-decoration: none;
-  }
-
-  & > h1 {
-    @include font-size(8);
-    line-height: 1.2;
-    margin: 0;
-    padding: 0;
-    color: $base-head;
-    font-weight: 200;
-    text-align: center;
-    margin-bottom: 16px;
-  }
-
-  & > .search {
-    margin-top: 32px;
-  }
-
-  & > .action {
-    margin-top: 32px;
-  }
-
-  & > .pubbox {
-    margin: 16px auto;
-  }
-
-  @media (min-width: 481px) {
-    & > .pubbox {
-      margin-top: 32px;
-      margin-bottom: 32px;
-    }
-  }
-}
diff --git a/src/sass/2017/markdown/local-anchor.scss b/src/sass/2017/markdown/local-anchor.scss
deleted file mode 100644
index 1937ae2d1..000000000
--- a/src/sass/2017/markdown/local-anchor.scss
+++ /dev/null
@@ -1,29 +0,0 @@
-.local-anchor {
-  & {
-    margin-left: -0.9em;
-    margin-right: 0.1em;
-    padding: 0 0.1em;
-  }
-
-  // Decoration
-  .MarkdownBody &,
-  .MarkdownBody &:visited {
-    color: $base-mute;
-    text-decoration: inherit;
-    opacity: 0.5;
-  }
-
-  .MarkdownBody &:target,
-  .MarkdownBody :target > & {
-    color: $base-a;
-    opacity: 1;
-  }
-
-  .MarkdownBody &:hover,
-  .MarkdownBody &:focus {
-    color: white;
-    background: $base-a;
-    opacity: 1;
-    text-decoration: inherit;
-  }
-}
diff --git a/src/sass/vendor/sanitize.css/sanitize.scss b/src/sass/vendor/sanitize.css/sanitize.scss
deleted file mode 100644
index c2a2503cf..000000000
--- a/src/sass/vendor/sanitize.css/sanitize.scss
+++ /dev/null
@@ -1,589 +0,0 @@
-/*! sanitize.css v5.0.0 | CC0 License | github.com/jonathantneal/sanitize.css */
-
-/* Document (https://html.spec.whatwg.org/multipage/semantics.html#semantics)
-   ========================================================================== */
-
-/**
- * 1. Remove repeating backgrounds in all browsers (opinionated).
- * 2. Add box sizing inheritence in all browsers (opinionated).
- */
-
-*,
-::before,
-::after {
-	background-repeat: no-repeat; /* 1 */
-	box-sizing: inherit; /* 2 */
-}
-
-/**
- * 1. Add text decoration inheritance in all browsers (opinionated).
- * 2. Add vertical alignment inheritence in all browsers (opinionated).
- */
-
-::before,
-::after {
-	text-decoration: inherit; /* 1 */
-	vertical-align: inherit; /* 2 */
-}
-
-/**
- * 1. Add border box sizing in all browsers (opinionated).
- * 2. Add the default cursor in all browsers (opinionated).
- * 3. Prevent font size adjustments after orientation changes in IE and iOS.
- */
-
-html {
-	box-sizing: border-box; /* 1 */
-	cursor: default; /* 2 */
-	-ms-text-size-adjust: 100%; /* 3 */
-	-webkit-text-size-adjust: 100%; /* 3 */
-}
-
-/* Sections (https://html.spec.whatwg.org/multipage/semantics.html#sections)
-   ========================================================================== */
-
-/**
- * Add the correct display in IE 9-.
- */
-
-article,
-aside,
-footer,
-header,
-nav,
-section {
-	display: block;
-}
-
-/**
- * Remove the margin in all browsers (opinionated).
- */
-
-body {
-	margin: 0;
-}
-
-/**
- * Correct the font size and margin on `h1` elements within `section` and
- * `article` contexts in Chrome, Firefox, and Safari.
- */
-
-h1 {
-	font-size: 2em;
-	margin: .67em 0;
-}
-
-/* Grouping content (https://html.spec.whatwg.org/multipage/semantics.html#grouping-content)
-   ========================================================================== */
-
-/**
- * Add the correct display in IE 9-.
- * 1. Add the correct display in IE.
- */
-
-figcaption,
-figure,
-main { /* 1 */
-	display: block;
-}
-
-/**
- * Add the correct margin in IE 8.
- */
-
-figure {
-	margin: 1em 40px;
-}
-
-/**
- * 1. Add the correct box sizing in Firefox.
- * 2. Show the overflow in Edge and IE.
- */
-
-hr {
-	box-sizing: content-box; /* 1 */
-	height: 0; /* 1 */
-	overflow: visible; /* 2 */
-}
-
-/**
- * Remove the list style on navigation lists in all browsers (opinionated).
- */
-
-nav ol,
-nav ul {
-	list-style: none;
-}
-
-/**
- * 1. Correct the inheritance and scaling of font size in all browsers.
- * 2. Correct the odd `em` font sizing in all browsers.
- */
-
-pre {
-	font-family: monospace, monospace; /* 1 */
-	font-size: 1em; /* 2 */
-}
-
-/* Text-level semantics (https://html.spec.whatwg.org/multipage/semantics.html#text-level-semantics)
-   ========================================================================== */
-
-/**
- * 1. Remove the gray background on active links in IE 10.
- * 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
- */
-
-a {
-	background-color: transparent; /* 1 */
-	-webkit-text-decoration-skip: objects; /* 2 */
-}
-
-/**
- * 1. Remove the bottom border in Firefox 39-.
- * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
- */
-
-abbr[title] {
-	border-bottom: none; /* 1 */
-	text-decoration: underline; /* 2 */
-	text-decoration: underline dotted; /* 2 */
-}
-
-/**
- * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
- */
-
-b,
-strong {
-	font-weight: inherit;
-}
-
-/**
- * Add the correct font weight in Chrome, Edge, and Safari.
- */
-
-b,
-strong {
-	font-weight: bolder;
-}
-
-/**
- * 1. Correct the inheritance and scaling of font size in all browsers.
- * 2. Correct the odd `em` font sizing in all browsers.
- */
-
-code,
-kbd,
-samp {
-	font-family: monospace, monospace; /* 1 */
-	font-size: 1em; /* 2 */
-}
-
-/**
- * Add the correct font style in Android 4.3-.
- */
-
-dfn {
-	font-style: italic;
-}
-
-/**
- * Add the correct background and color in IE 9-.
- */
-
-mark {
-	background-color: #ffff00;
-	color: #000000;
-}
-
-/**
- * Add the correct font size in all browsers.
- */
-
-small {
-	font-size: 80%;
-}
-
-/**
- * Prevent `sub` and `sup` elements from affecting the line height in
- * all browsers.
- */
-
-sub,
-sup {
-	font-size: 75%;
-	line-height: 0;
-	position: relative;
-	vertical-align: baseline;
-}
-
-sub {
-	bottom: -.25em;
-}
-
-sup {
-	top: -.5em;
-}
-
-/*
- * Remove the text shadow on text selections (opinionated).
- * 1. Restore the coloring undone by defining the text shadow (opinionated).
- */
-
-::-moz-selection {
-	background-color: #b3d4fc; /* 1 */
-	color: #000000; /* 1 */
-	text-shadow: none;
-}
-
-::selection {
-	background-color: #b3d4fc; /* 1 */
-	color: #000000; /* 1 */
-	text-shadow: none;
-}
-
-/* Embedded content (https://html.spec.whatwg.org/multipage/embedded-content.html#embedded-content)
-   ========================================================================== */
-
-/*
- * Change the alignment on media elements in all browers (opinionated).
- */
-
-audio,
-canvas,
-iframe,
-img,
-svg,
-video {
-	vertical-align: middle;
-}
-
-/**
- * Add the correct display in IE 9-.
- */
-
-audio,
-video {
-	display: inline-block;
-}
-
-/**
- * Add the correct display in iOS 4-7.
- */
-
-audio:not([controls]) {
-	display: none;
-	height: 0;
-}
-
-/**
- * Remove the border on images inside links in IE 10-.
- */
-
-img {
-	border-style: none;
-}
-
-/**
- * Change the fill color to match the text color in all browsers (opinionated).
- */
-
-svg {
-	fill: currentColor;
-}
-
-/**
- * Hide the overflow in IE.
- */
-
-svg:not(:root) {
-	overflow: hidden;
-}
-
-/* Tabular data (https://html.spec.whatwg.org/multipage/tables.html#tables)
-   ========================================================================== */
-
-/**
- * Collapse border spacing
- */
-
-table {
-	border-collapse: collapse;
-}
-
-/* Forms (https://html.spec.whatwg.org/multipage/forms.html#forms)
-   ========================================================================== */
-
-/**
- * Remove the margin in Firefox and Safari.
- */
-
-button,
-input,
-optgroup,
-select,
-textarea {
-	margin: 0;
-}
-
-/**
- * Inherit styling in all browsers (opinionated).
- */
-
-button,
-input,
-select,
-textarea {
-	background-color: transparent;
-	color: inherit;
-	font-size: inherit;
-	line-height: inherit;
-}
-
-/**
- * Show the overflow in IE.
- * 1. Show the overflow in Edge.
- */
-
-button,
-input { /* 1 */
-	overflow: visible;
-}
-
-/**
- * Remove the inheritance of text transform in Edge, Firefox, and IE.
- * 1. Remove the inheritance of text transform in Firefox.
- */
-
-button,
-select { /* 1 */
-	text-transform: none;
-}
-
-/**
- * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
- *    controls in Android 4.
- * 2. Correct the inability to style clickable types in iOS and Safari.
- */
-
-button,
-html [type="button"], /* 1 */
-[type="reset"],
-[type="submit"] {
-	-webkit-appearance: button; /* 2 */
-}
-
-/**
- * Remove the inner border and padding in Firefox.
- */
-
-button::-moz-focus-inner,
-[type="button"]::-moz-focus-inner,
-[type="reset"]::-moz-focus-inner,
-[type="submit"]::-moz-focus-inner {
-	border-style: none;
-	padding: 0;
-}
-
-/**
- * Restore the focus styles unset by the previous rule.
- */
-
-button:-moz-focusring,
-[type="button"]:-moz-focusring,
-[type="reset"]:-moz-focusring,
-[type="submit"]:-moz-focusring {
-	outline: 1px dotted ButtonText;
-}
-
-/**
- * 1. Correct the text wrapping in Edge and IE.
- * 2. Correct the color inheritance from `fieldset` elements in IE.
- * 3. Remove the padding so developers are not caught out when they zero out
- *    `fieldset` elements in all browsers.
- */
-
-legend {
-	box-sizing: border-box; /* 1 */
-	color: inherit; /* 2 */
-	display: table; /* 1 */
-	max-width: 100%; /* 1 */
-	padding: 0; /* 3 */
-	white-space: normal; /* 1 */
-}
-
-/**
- * 1. Add the correct display in IE 9-.
- * 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
- */
-
-progress {
-	display: inline-block; /* 1 */
-	vertical-align: baseline; /* 2 */
-}
-
-/**
- * 1. Remove the default vertical scrollbar in IE.
- * 2. Change the resize direction on textareas in all browsers (opinionated).
- */
-
-textarea {
-	overflow: auto; /* 1 */
-	resize: vertical; /* 2 */
-}
-
-/**
- * 1. Add the correct box sizing in IE 10-.
- * 2. Remove the padding in IE 10-.
- */
-
-[type="checkbox"],
-[type="radio"] {
-	box-sizing: border-box; /* 1 */
-	padding: 0; /* 2 */
-}
-
-/**
- * Correct the cursor style of increment and decrement buttons in Chrome.
- */
-
-[type="number"]::-webkit-inner-spin-button,
-[type="number"]::-webkit-outer-spin-button {
-	height: auto;
-}
-
-/**
- * 1. Correct the odd appearance in Chrome and Safari.
- * 2. Correct the outline style in Safari.
- */
-
-[type="search"] {
-	-webkit-appearance: textfield; /* 1 */
-	outline-offset: -2px; /* 2 */
-}
-
-/**
- * Remove the inner padding and cancel buttons in Chrome and Safari on macOS.
- */
-
-[type="search"]::-webkit-search-cancel-button,
-[type="search"]::-webkit-search-decoration {
-	-webkit-appearance: none;
-}
-
-/**
- * 1. Correct the inability to style clickable types in iOS and Safari.
- * 2. Change font properties to `inherit` in Safari.
- */
-
-::-webkit-file-upload-button {
-	-webkit-appearance: button; /* 1 */
-	font: inherit; /* 2 */
-}
-
-/* Interactive elements (https://html.spec.whatwg.org/multipage/forms.html#interactive-elements)
-   ========================================================================== */
-
-/*
- * Add the correct display in IE 9-.
- * 1. Add the correct display in Edge, IE, and Firefox.
- */
-
-details, /* 1 */
-menu {
-	display: block;
-}
-
-/*
- * Add the correct display in all browsers.
- */
-
-summary {
-	display: list-item;
-}
-
-/* Scripting (https://html.spec.whatwg.org/multipage/scripting.html#scripting-3)
-   ========================================================================== */
-
-/**
- * Add the correct display in IE 9-.
- */
-
-canvas {
-	display: inline-block;
-}
-
-/**
- * Add the correct display in IE.
- */
-
-template {
-	display: none;
-}
-
-/* User interaction (https://html.spec.whatwg.org/multipage/interaction.html#editing)
-   ========================================================================== */
-
-/*
- * Remove the tapping delay on clickable elements (opinionated).
- * 1. Remove the tapping delay in IE 10.
- */
-
-a,
-area,
-button,
-input,
-label,
-select,
-summary,
-textarea,
-[tabindex] {
-	-ms-touch-action: manipulation; /* 1 */
-	touch-action: manipulation;
-}
-
-/**
- * Add the correct display in IE 10-.
- */
-
-[hidden] {
-	display: none;
-}
-
-/* ARIA (https://w3c.github.io/html-aria/)
-   ========================================================================== */
-
-/**
- * Change the cursor on busy elements (opinionated).
- */
-
-[aria-busy="true"] {
-	cursor: progress;
-}
-
-/*
- * Change the cursor on control elements (opinionated).
- */
-
-[aria-controls] {
-	cursor: pointer;
-}
-
-/*
- * Change the display on visually hidden accessible elements (opinionated).
- */
-
-[aria-hidden="false"][hidden]:not(:focus) {
-	clip: rect(0, 0, 0, 0);
-	display: inherit;
-	position: absolute;
-}
-
-/*
- * Change the cursor on disabled, not-editable, or otherwise
- * inoperable elements (opinionated).
- */
-
-[aria-disabled] {
-	cursor: default;
-}