Check content folder only

Author: oruebel

.github/workflows/link-check.yml

@@ -19,4 +19,4 @@ jobs:
         id: lychee
         uses: lycheeverse/lychee-action@v2
         with:
-          args: --verbose --no-progress --exclude "https://example.com" './**/*.md' './**/*.html' './**/*.rst'
+          args: --verbose --no-progress './content/**/*.md' './content/**/*.html' './content/**/*.rst'