Update doc strings and readthedocs build

[chrisjonesBSU]

This PR makes a large update to the doc strings across the msibi classes and methods. It also makes some changes to the sphinx documentation source files. Making a few tutorials, and adding them to the docs, will be done in a different PR.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@2ea798d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
msibi/forces.py	40.00%	9 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage        ?   83.90%           
=======================================
  Files           ?       10           
  Lines           ?      646           
  Branches        ?        0           
=======================================
  Hits            ?      542           
  Misses          ?      104           
  Partials        ?        0           

Files with missing lines	Coverage Δ
msibi/optimize.py	94.44% <ø> (ø)
msibi/state.py	89.61% <100.00%> (ø)
msibi/forces.py	83.49% <40.00%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.