API docs

[TomNicholas]

Cleans up and exposes a more useful and minimal subset of the API (so defining the public API).

Also changes some autodoc configuration to get everything to look nice with links and so on, basically just copying the way it was done in Cubed.

[TomNicholas]

It would be nice to not have all the pydantic-specific methods on the ChunkManifest class be included in the API docs, but that can wait.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.28%. Comparing base (7927fe3) to head (4a5a6aa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   90.04%   90.28%   +0.24%     
==========================================
  Files          13       13              
  Lines         944      937       -7     
==========================================
- Hits          850      846       -4     
+ Misses         94       91       -3     

Flag	Coverage Δ
unittests	90.28% <100.00%> (+0.24%)	⬆️

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