Add custom css/js, move to myst-nb and add notebook support

[timkpaine]

No description provided.

[github-actions]

Test Results

2 tests  ±0   2 ✅ ±0   8s ⏱️ +3s
1 suites ±0   0 💤 ±0 
1 files   ±0   0 ❌ ±0 

Results for commit 75fe45a. ± Comparison against base commit cf2f824.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.19%. Comparing base (cf2f824) to head (75fe45a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   81.35%   81.19%   -0.16%     
==========================================
  Files           5        5              
  Lines         118      117       -1     
  Branches       25       24       -1     
==========================================
- Hits           96       95       -1     
  Misses         14       14              
  Partials        8        8              

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