CI: add URL checks searching for broken HTTP links in source code, docs, etc

[slayoo]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.38%. Comparing base (1da8001) to head (99ceb63).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #434      +/-   ##
==========================================
- Coverage   90.76%   90.38%   -0.38%     
==========================================
  Files          55       55              
  Lines        2491     2455      -36     
  Branches      135      139       +4     
==========================================
- Hits         2261     2219      -42     
- Misses        158      163       +5     
- Partials       72       73       +1     

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[Griger5]

Looks good. An automatic URL checker is a very good idea for documentation maintainability!