Github Actions Link Checker

[jneilliii]

I just noticed a couple of my plugins that were recently merged were missing screenshots, and after looking into it, issue seemed to be related to invalid links, both in the featured image section and within the detailed description at the bottom. I think this is a result of switching from Travis to Github Actions as the Travis build would error if links were invalid. I remember the checks would not pass before if the links didn't work.

[foosel]

There's now a link checker as part of the validation steps.

[foosel]

Turns out the link check caused the build to run into rate limiting issues, so I had to disable it again. Might have to use a different check, ideally with result caching between checked pages (the one right now checks links that are included in the footer for example again and again and again)