fix: layerize Nerdy.dev's CSS correctly

[bartveneman]

closes #13

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (582e9e7) to head (329a98f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #14   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          192       206   +14     
=========================================
+ Hits           192       206   +14     

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[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 219 bytes (2.44%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
cssLayerTree-esm	3.58kB	219 bytes (6.51%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: cssLayerTree-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
css-*.js	219 bytes	3.58kB	6.51% ⚠️

Files in css-*.js:

• ./src/index.js → Total Size: 3.89kB