fix: include static files in Python package

[Agrendalath]

The previous setup.py changes removed static files from the Python package.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (8633c2e) 62.65% compared to head (dcb7cf9) 62.65%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   62.65%   62.65%           
=======================================
  Files           4        4           
  Lines         166      166           
  Branches       15       15           
=======================================
  Hits          104      104           
  Misses         61       61           
  Partials        1        1           

Flag	Coverage Δ
unittests	62.65% <100.00%> (ø)

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Impacted Files	Coverage Δ
html_xblock/__init__.py	100.00% <100.00%> (ø)

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