Update Read the Docs configuration for Sphinx

[fnattino]

Not having this is the docs is deprecated

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.14%. Comparing base (4e8138c) to head (94722e4).
⚠️ Report is 7 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #65   +/-   ##
=======================================
  Coverage   84.14%   84.14%           
=======================================
  Files          14       14           
  Lines        1091     1091           
  Branches      156      156           
=======================================
  Hits          918      918           
  Misses        127      127           
  Partials       46       46           

Flag	Coverage Δ
unittests	84.14% <ø> (ø)

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