feat: RTD version selector

[flying-sheep]

Flyout docs are here: https://docs.readthedocs.com/platform/latest/flyout-menu.html

Base layout is here: https://github.com/pydata/pydata-sphinx-theme/blob/main/src/pydata_sphinx_theme/theme/pydata_sphinx_theme/layout.html

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.55%. Comparing base (38ead64) to head (fe35a86).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   95.55%   95.55%           
=======================================
  Files           6        6           
  Lines         360      360           
=======================================
  Hits          344      344           
  Misses         16       16           

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[read-the-docs-community]

Documentation build overview

📚 scverse-doc | 🛠️ Build #34805584 | 📁 Comparing fe35a86 against latest (a8273c8)

  🔍 Preview build  

1 file changed

± api/registry.html