Formatting and linting

[eytanadler]

Purpose

Formatted the openconcept codebase and addressed flake8's complaints. It also renames the docs to doc to be consistent with the other MDO Lab codes. Finally, it removes the docs extensions (in the _exts folder).

Type of change

What types of change is it? Select the appropriate type(s) that describe this PR

• Code style update (formatting, renaming)

Testing

Explain the steps needed to test the new code to verify that it does indeed address the issue and produce the expected behavior.

Checklist

Put an x in the boxes that apply.

• [x] I have run unit and regression tests which pass locally with my changes
• [x] I have added new tests that prove my fix is effective or that my feature works
• [x] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #42 (6ea79bf) into main (1c407d9) will decrease coverage by 0.25%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   81.22%   80.96%   -0.26%     
==========================================
  Files          84       84              
  Lines        9127     8967     -160     
==========================================
- Hits         7413     7260     -153     
+ Misses       1714     1707       -7     

Impacted Files	Coverage Δ
costs/__init__.py	0.00% <0.00%> (-100.00%)	:arrow_down:
examples/HybridTwin_active_thermal.py	0.00% <0.00%> (-8.20%)	:arrow_down:
costs/costs_commuter.py	0.00% <0.00%> (-7.60%)	:arrow_down:
thermal/ducts.py	90.67% <0.00%> (-0.46%)	:arrow_down:
utilities/math/derivatives.py	95.06% <0.00%> (-0.40%)	:arrow_down:
examples/HybridTwin.py	54.09% <0.00%> (-0.38%)	:arrow_down:
examples/KingAirC90GT.py	79.36% <0.00%> (-0.33%)	:arrow_down:
utilities/math/combine_split_comp.py	87.93% <0.00%> (-0.31%)	:arrow_down:
utilities/math/integrals.py	91.02% <0.00%> (-0.20%)	:arrow_down:
examples/Caravan.py	77.77% <0.00%> (-0.19%)	:arrow_down:
... and 54 more

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