Add md-links-check workflow

[alezkv]

No description provided.

[alezkv]

Fill free to trow away GitHub Action if you have any concerns about that.
And thanks for this project. Going to use it on day-to-day basis.

[codecov]

Codecov Report

Merging #467 (70b1707) into main (3377d16) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #467   +/-   ##
=======================================
  Coverage   77.66%   77.66%           
=======================================
  Files          23       23           
  Lines        2717     2717           
=======================================
  Hits         2110     2110           
  Misses        538      538           
  Partials       69       69           

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[synfinatic]

Thanks for the PR @alezkv. Having good docs is important and this will help a lot!