👌 IMPROVE: cache bust changes to CSS

[chrisjsewell]

by adding to sphinx builds with file named with content hash

[codecov]

Codecov Report

Base: 81.74% // Head: 81.77% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (9fc5945) compared to base (5e29f9d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #447      +/-   ##
==========================================
+ Coverage   81.74%   81.77%   +0.02%     
==========================================
  Files          29       29              
  Lines        2630     2639       +9     
==========================================
+ Hits         2150     2158       +8     
- Misses        480      481       +1     

Flag	Coverage Δ
pytests	81.77% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
myst_nb/sphinx_ext.py	92.23% <100.00%> (+0.74%)	⬆️
myst_nb/core/render.py	85.34% <0.00%> (-0.22%)	⬇️

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