docs: use major & minor version for docs subdir

[kelly-sovacool]

Changes

to match our other repos which use mkdocs + mike for multiple versions on the docs website

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 (dcf9687) to head (2c77510).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   29.92%   29.92%           
=======================================
  Files          17       17           
  Lines        1260     1260           
=======================================
  Hits          377      377           
  Misses        883      883           

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