Migrate to mkdocs

[glass-ships]

Migrates documentation to using mkdocs and mkdocstrings with the Read the Docs theme.

To test:

• checkout the mkdocs branch
• install/update conda environment to include mkdocs dependencies
• run mkdocs serve

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.85%. Comparing base (81e811a) to head (7a9231a).

Additional details and impacted files

@@            Coverage Diff             @@
##             next      #55      +/-   ##
==========================================
- Coverage   85.87%   85.85%   -0.03%     
==========================================
  Files          20       20              
  Lines        2478     2474       -4     
==========================================
- Hits         2128     2124       -4     
  Misses        350      350              

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