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.)

• [x] 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.~
• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 29.92%. Comparing base (dcf9687) to head (2c77510). Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ 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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