CAZyme annotations on MAGs

[SandyRogers]

This PR:

• adds annotations to MAGs, and specific handling for cazy annotations (bar chart, API, TSV, importer)
• fixes a config bug with code coverage calc
• adds new MAG features (CAZymes and sample containment) to the docs

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 5 lines in your changes missing coverage. Please review.

Project coverage is 83.39%. Comparing base (a98c3ce) to head (686a513).

Files	Patch %	Lines
holofood/filters.py	76.92%	3 Missing ⚠️
holofood/forms.py	96.15%	1 Missing ⚠️
holofood/views.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   78.81%   83.39%   +4.58%     
==========================================
  Files          69       28      -41     
  Lines        2695     1813     -882     
==========================================
- Hits         2124     1512     -612     
+ Misses        571      301     -270     

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