Modifications after first test

[thomascobb]

• simplify github actions
• mypy runs on just src/ and test/ directory
• make lint output more verbose
• remove Pipfile.lock as it is very project specific
• increase setuptools cap to last compatible with dls-python3 version

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (skeleton@e5bfae7). Click here to learn what that means. The diff coverage is n/a.

@@             Coverage Diff              @@
##             skeleton        #4   +/-   ##
============================================
  Coverage            ?   100.00%           
============================================
  Files               ?         3           
  Lines               ?        28           
  Branches            ?         0           
============================================
  Hits                ?        28           
  Misses              ?         0           
  Partials            ?         0           

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