ignore root-relative links in lychee link check

Exclude root-relative paths (/…) from the lychee link checker to prevent InvalidPathToUri errors when scanning the built _site HTML. This keeps external link validation intact while avoiding false CI failures on internal site links.

Author: InessaPawson

.github/workflows/linkcheck.yml

@@ -32,7 +32,11 @@ jobs:
         id: lychee
         uses: lycheeverse/lychee-action@a8c4c7cb88f0c7386610c35eb25108e448569cb0 #v2.7.0
         with:
-          args: --verbose --no-progress _site/*.html
+          args: >
+            --verbose
+            --no-progress
+            --exclude '^/.*'
+            _site
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}