Update coverage for codecov

[trappitsch]

• Update badges in readme and docs
• Exclude noxfile.py from coverage

[codecov[bot]]

Codecov Report

Merging #86 (b93bda6) into main (29e3f78) will increase coverage by 2.53%. The diff coverage is n/a.

@@             Coverage Diff             @@
##             main       #86      +/-   ##
===========================================
+ Coverage   97.46%   100.00%   +2.53%     
===========================================
  Files          24        23       -1     
  Lines        1501      1463      -38     
===========================================
  Hits         1463      1463              
+ Misses         38         0      -38     

Flag	Coverage Δ
unittests	100.00% <ø> (+2.53%)	:arrow_up:

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see 1 file with indirect coverage changes

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