maint: remove setup.py

[steven-murray]

Simply removes setup.py since we don't need it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2289356) to head (e8a985b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #85   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          566       566           
  Branches        88        88           
=========================================
  Hits           566       566           

Flag	Coverage Δ
unittests	99.29% <ø> (ø)

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