Add module docstrings

[kelly-sovacool]

Changes

Add minimal module docstrings

Also move template-related functions to the templates module

Issues

NA

PR Checklist

(Strikethrough any points that are not applicable.)

• This comment contains a description of changes with justifications, with any relevant issues linked.
• Write unit tests for any new features, bug fixes, or other code changes.
• Update docs if there are any API changes.
• Update CHANGELOG.md with a short description of any user-facing changes and reference the PR number. Guidelines: https://keepachangelog.com/en/1.1.0/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.92%. Comparing base (9725718) to head (e27b9c0).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   35.37%   29.92%   -5.46%     
==========================================
  Files          13       17       +4     
  Lines        1046     1260     +214     
==========================================
+ Hits          370      377       +7     
- Misses        676      883     +207     

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