[CI] Stop link check run on push event, and add reStructureText check (#7502)

Author: Echo-Nie

.github/workflows/link-check.yml

@@ -2,9 +2,6 @@ name: Link Checker
 
 on:
   repository_dispatch:
-  push:
-    branches:
-      - develop
   workflow_dispatch:
   schedule:
     - cron: "00 18 * * 0"
@@ -21,7 +18,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
         with:
-            args: --verbose --no-progress --max-redirects 8 './**/*.md'
+            args: --verbose --no-progress --max-redirects 8 './**/*.md' './**/*.rst'
             format: markdown
             fail: false
             output: lychee/results.md