Update docs: Add extras-core documentation and update category positions

[kevin-lee]

Update docs: Add extras-core documentation and update category positions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.66%. Comparing base (fcdf74c) to head (a20f502).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #602   +/-   ##
=======================================
  Coverage   89.66%   89.66%           
=======================================
  Files          46       46           
  Lines         726      726           
  Branches       48       47    -1     
=======================================
  Hits          651      651           
  Misses         75       75           

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