Better pyscript sphinx

[AndrewAnnex]

adds custom sphinx extension to make it easier to have python editor shells and re-use highlighter style for them

begins updates to other_stuff.rst to enable interactivity.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.61%. Comparing base (e2a11e7) to head (0fa0648).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #529   +/-   ##
=======================================
  Coverage   99.61%   99.61%           
=======================================
  Files          17       17           
  Lines       17893    17893           
=======================================
  Hits        17824    17824           
  Misses         69       69           

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