Item

Done! 

**Summary:**

Built `broken-link-checker.sh` - a script that:
- Checks websites for broken/404 links
- Filters out noise (Google Fonts, anchors, mailto)
- Prioritizes internal 404s over external ones
- Works on macOS (fixed grep compatibility issues)
- Usage: `./scripts/broken-link-checker.sh [URL] [--all]`

Posted to Discord #tägliche-aufgaben (1471766844514767012).