Animal docs update

[TaranRallings]

Description

This is a basic update of the animal docs to get the basic ideas and implementation structure across. My main goal with this docs update is to provide something folks who see our poster at BES this week. This is time sensitive so I would like to get it up asap and I am happy to make revisions after the fact.

Fixes # (issue)

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works
• Relevant documentation reviewed and updated

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.69%. Comparing base (15352ab) to head (1a90ce3).
Report is 1018 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #634   +/-   ##
========================================
  Coverage    94.69%   94.69%           
========================================
  Files           73       73           
  Lines         4582     4582           
========================================
  Hits          4339     4339           
  Misses         243      243           

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[vgro]

Looks very good to me, very clear and well structured. I think it is the perfect level of detail for the current status of the model and will be very useful for people who check out the model at this stage.

[davidorme]

LGTM - some minor nitpicks.