Docs cleanup

[janezpodhostnik]

Just some docs cleanup, so the new docs are correctly generated by mkdocs.

[codecov-commenter]

Codecov Report

Merging #30 (6975b7e) into master (4f0d89d) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   79.92%   79.90%   -0.02%     
==========================================
  Files          26       26              
  Lines        1514     1513       -1     
  Branches       93       92       -1     
==========================================
- Hits         1210     1209       -1     
  Misses        288      288              
  Partials       16       16              

Flag	Coverage Δ
unittests	79.90% <100.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
flow_py_sdk/__init__.py	100.00% <100.00%> (ø)
flow_py_sdk/client/entities.py	47.36% <100.00%> (-0.40%)	⬇️

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