Incredibly Fancy Liveness Checking for Links

[samuel-skean]

Wouldn't it be great if the server made sure that the links (and QR codes) were valid, and threw up a nice clean error message if/when they weren't?

I think that's the "right" way to build this, and goes a long way towards actually justifying this as a web app.

• Check the validity of links live, in the background, throwing up an error if any one of them falls offline.
  • Bonus points if the error appears nicely over each one that goes offline, and "looks right" (whatever that means to you) for QR codes, too.
• Use github actions to make sure all the links are live on every push + PR. Use the same code (please).
  • Bonus points if this applies to references to files in the repo in docs (links in markdown, for example).