Don't fail lychee-action on broken links

Xref lycheeverse/lychee-action#85

Author: weiji14

.github/workflows/check-links.yml

@@ -37,6 +37,7 @@ jobs:
       id: lychee
       uses: lycheeverse/[email protected]
       with:
+        fail: false  # Don't fail action on broken links
         output: /tmp/lychee-out.md
         # 429: Too many requests
         args: >