Adding rtd configuration

[bmcfee]

Making sure that doc site builds stay current...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.35%. Comparing base (03619ff) to head (61bbf16).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #227   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files          10       10           
  Lines        1081     1081           
=======================================
  Hits         1074     1074           
  Misses          7        7           

Flag	Coverage Δ
unittests	99.35% <ø> (ø)

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