Added cache + check email/fragments to lychee

Co-Authored-By: MichaIng <micha@dietpi.com>

Author: adamlui

.github/workflows/validate-links-on-push-pr.yml

@@ -32,8 +32,10 @@ jobs:
           # Check all MD files, ignore ok/redir/blocked/rate-limited, exclude commonly down domains
           args: >-
             "*.md" "**/*.md"
-            --verbose --no-progress
+            --verbose --no-progress --include-mail
+            --include-fragments --index-files README.md --exclude "#readme"
             --accept 200..299,300..399,403,429
+            --cache --max-cache-age 3d
             --exclude api\.star-history\.com --exclude ghostbrowser\.com
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}