Drop broken sphinx docs build

[ethanwharris]

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #661 (97ef36f) into master (b766cc3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #661   +/-   ##
=======================================
  Coverage   90.58%   90.58%           
=======================================
  Files         173      173           
  Lines        9232     9232           
=======================================
  Hits         8363     8363           
  Misses        869      869           

Flag	Coverage Δ
unittests	90.58% <ø> (ø)

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