Patch CONTRIBUTING.md guideline

[skim0119]

Update

• Remove outdated commands, and replace them with poetry commands.
• Update documentation readme

[codecov-commenter]

Codecov Report

Merging #55 (67a4b13) into main (b9d48bc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   41.74%   41.74%           
=======================================
  Files          24       24           
  Lines         721      721           
  Branches       84       84           
=======================================
  Hits          301      301           
  Misses        418      418           
  Partials        2        2           

Flag	Coverage Δ
unittests	41.74% <ø> (ø)

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