FIX: lychee command (#352)

Author: mmcky

.github/workflows/linkcheck.yml

@@ -21,7 +21,7 @@ jobs:
         uses: lycheeverse/lychee-action@v2
         with:
           fail: false
-          args: --accept 403 .
+          args: --accept 403,503 *.html
       - name: Create Issue From File
         if: steps.lychee.outputs.exit_code != 0
         uses: peter-evans/create-issue-from-file@v5