Automated doxygen documenation to github pages

[jcurtis2]

CI builds Doxygen documentation in Docker and uploads it https://compdyn.github.io/partmc/

As a final step, it will get switched from doxygen branch to master.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.50%. Comparing base (04150bd) to head (7c67851).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
+ Coverage   76.48%   76.50%   +0.02%     
==========================================
  Files          54       54              
  Lines        9118     9118              
==========================================
+ Hits         6974     6976       +2     
+ Misses       2144     2142       -2     

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