Delete obsolete github actions & redundant markdown

[ponyisi]

Fix #1119

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.77%. Comparing base (e68e6a4) to head (9cba63d).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1196      +/-   ##
===========================================
- Coverage    85.83%   85.77%   -0.07%     
===========================================
  Files           94       94              
  Lines         3191     3191              
  Branches       359      359              
===========================================
- Hits          2739     2737       -2     
- Misses         378      380       +2     
  Partials        74       74              

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