fix: include static files in Python package

[Agrendalath]

Fixes the setup.py update from #335.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (898cf65) 44.24% compared to head (aef9af1) 44.24%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #338   +/-   ##
=======================================
  Coverage   44.24%   44.24%           
=======================================
  Files          42       42           
  Lines        3372     3372           
  Branches      480      480           
=======================================
  Hits         1492     1492           
  Misses       1832     1832           
  Partials       48       48           

Flag	Coverage Δ
unittests	44.24% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)
problem_builder/__init__.py	100.00% <100.00%> (ø)

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