Clean up the API documentation so it properly links to the code

[TomWagg]

This adds several docs pages with the API for all of the functions.

I also added the logo to the main and about pages.

[github-actions]

🚨 CMC review requested

This pull request modifies one or more of:

• src/cosmic/evolve.py
• src/cosmic/data/cosmic-settings.json (only flagged when category: "bse" key-count changes)

Trigger: evolve file changed, probably needs CMC review

A CMC developer should review this PR to ensure corresponding changes are propagated upstream as needed.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.31%. Comparing base (8772c07) to head (4cd3c28).
⚠️ Report is 163 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/cosmic/evolve.py	0.00%	1 Missing ⚠️
src/cosmic/sample/cmc/elson.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #791       +/-   ##
============================================
- Coverage    86.91%   76.31%   -10.60%     
============================================
  Files           40       58       +18     
  Lines        25542    28097     +2555     
  Branches         0      919      +919     
============================================
- Hits         22198    21440      -758     
- Misses        3344     6353     +3009     
- Partials         0      304      +304     

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[katiebreivik]

👍