Every Sunday at midnight this Github action will validate that all
http/https links responds with 200. If a link has been permanently
removed (or just moved) it can be removed/changed which leads to a
higher quality list.
This check is already in place in the mac-setup[0] repo and is working
well. It won't prevent any PRs from getting merged, and optionally a
badge can be added to the README to highlight the link status (see
mac-setup repo).
[0]: https://github.com/sb2nov/mac-setup/