Add action to automatically sync check_links.yml workflow with main Jabref/jabref repo

[Tridecatrix]

As suggested here https://github.com/JabRef/user-documentation/pull/526#issuecomment-2416490491.

See partial work here: https://github.com/JabRef/user-documentation/pull/531#issuecomment-2418791254

Personally don't have the Github workflow knowledge to pull this off in a timely manner

Though should also discuss: if #533 is resolved then the .lycheeignore will be drastically improved on this repo compared to on JabRef. It might actually make more sense to sync the other way, i.e. copy check_links.yml and .lycheeignore over from this repo to main JabRef? This repo contains more documentation and links to check/ignore after all.

Or perhaps abandon syncing completely if the different repos have different link checking needs? (in which case we can close this issue)