Add readthedocs integration example

[tristanlatr]

Preview: https://pydoctor--830.org.readthedocs.build/en/830/publish-readthedocs.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.29%. Comparing base (bc101b4) to head (a734ba0).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #830   +/-   ##
=======================================
  Coverage   92.29%   92.29%           
=======================================
  Files          47       47           
  Lines        8514     8514           
  Branches     1695     1695           
=======================================
  Hits         7858     7858           
  Misses        385      385           
  Partials      271      271           

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[tristanlatr]

This works, I’ve tested it there https://libstatic.readthedocs.io