Update the Python and Git chapters

[rickecon]

• make documentation, make format, and make test have been run locally on my machine.

This PR updates the Python and Git chapters with content in the .md files as well as data, images, and code.

[codecov]

Codecov Report

Merging #9 (4135069) into main (d047fa7) will decrease coverage by 0.78%.
The diff coverage is 65.81%.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   66.66%   65.89%   -0.78%     
==========================================
  Files           2        4       +2     
  Lines          12      129     +117     
==========================================
+ Hits            8       85      +77     
- Misses          4       44      +40     

Flag	Coverage Δ
unittests	65.89% <65.81%> (-0.78%)	⬇️

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Files	Coverage Δ
code/UnitTest/test_specs.py	100.00% <100.00%> (ø)
setup.py	0.00% <ø> (ø)
code/UnitTest/specs.py	46.66% <46.66%> (ø)

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