Use GitHub Actions for documentation deployment

[twyatt]

Migrates documentation deployment to use "GitHub Action" as source rather than a dedicated branch (which clutters up the git history).

Before	After

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.01%. Comparing base (a49130e) to head (e33dcbb).

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #51   +/-   ##
=========================================
  Coverage     82.01%   82.01%           
  Complexity      116      116           
=========================================
  Files            15       15           
  Lines           189      189           
  Branches         16       16           
=========================================
  Hits            155      155           
  Misses           31       31           
  Partials          3        3           

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