Prepare CI and docs for branch rename

And also remove `v4` reference.

.github/workflows/build-cordova.yml

@@ -18,8 +18,7 @@ on:
 
     push:
         branches:
-            - "v4"
-            - "master"
+            - "main"
             - "feature/**"
             - "fix/**"
         paths:

.github/workflows/build-electron.yml

@@ -19,8 +19,7 @@ on:
 
     push:
         branches:
-            - "v4"
-            - "master"
+            - "main"
             - "feature/**"
             - "fix/**"
         paths:

.github/workflows/build-tauri.yml

@@ -9,8 +9,7 @@ on:
 
     push:
         branches:
-            - "v4"
-            - "master"
+            - "main"
             - "feature/**"
             - "fix/**"
         paths:

.github/workflows/build-web-extension.yml

@@ -14,8 +14,7 @@ on:
 
     push:
         branches:
-            - "v4"
-            - "master"
+            - "main"
             - "feature/**"
             - "fix/**"
         paths:

.github/workflows/update-deployment.yml

@@ -5,8 +5,7 @@ on:
 
     push:
         branches:
-            - "v4"
-            - "master"
+            - "main"
         paths:
             - "packages/app/**"
             - "packages/core/**"

docs/checksums/web/README.md

@@ -14,15 +14,15 @@ Windows systems, we suggest you run them via WSL2.
     ```bash
     git clone git@github.com:padloc/padloc.git && \
     cd padloc && \
-    git pull origin/v4 && \
+    git pull origin/main && \
     npm install
     ```
 
-2. Build code (replace `beta.padloc.app` with whatever domain you're trying to
+2. Build code (replace `web.padloc.app` with whatever domain you're trying to
    check, if not padloc's production):
 
     ```bash
-    PL_PWA_URL=https://beta.padloc.app \
+    PL_PWA_URL=https://web.padloc.app \
     PL_SERVER_URL=$PL_PWA_URL/server/ \
     npm run pwa:build
     ```
@@ -163,11 +163,11 @@ Windows systems, we suggest you run them via WSL2.
 
 ## Verify what you're using has the same source code
 
-1. Download a website (replace `beta.padloc.app` with whatever domain you're
+1. Download a website (replace `web.padloc.app` with whatever domain you're
    trying to check), and all the relevant files:
 
     ```bash
-    HOST_TO_CHECK=beta.padloc.app && \
+    HOST_TO_CHECK=web.padloc.app && \
     wget -r -p -U Mozilla https://$HOST_TO_CHECK && \
     cd $HOST_TO_CHECK && \
     wget https://github.com/padloc/padloc/releases/latest/download/parse-csp.ts && \