Remove doc references to setup.py

[mraspaud]

This PR removes outdated references to setup.py.

• Closes Documentation points to missing setup.py #2782

[pnuu]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.94%. Comparing base (05fdcbf) to head (87d072d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2786   +/-   ##
=======================================
  Coverage   95.94%   95.94%           
=======================================
  Files         379      379           
  Lines       53693    53693           
=======================================
  Hits        51515    51515           
  Misses       2178     2178           

Flag	Coverage Δ
behaviourtests	4.09% <ø> (ø)
unittests	96.04% <ø> (ø)

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[coveralls]

Pull Request Test Coverage Report for Build 8779757089

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 8779608590:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls

[ameraner]

LGTM, thanks for fixing this!