Remove long-deprecated `khan-exercise.css`#875

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jeremywiebe wants to merge 9 commits intomainfrom lc-1482.content-editor-code

+245-1,524

Commits on Aug 13, 2024

Commits on Feb 20, 2025

[lc-1482 .content-editor-code] Merge branch 'main' into lc-1482 .content-editor-code
mark-fitzgerald
committed
[lc-1482 .content-editor-code] Relocate styles that are still used (from khan-exercise.css)
mark-fitzgerald
committed

Commits on Feb 22, 2025

[lc-1482 .content-editor-code] Remove references to 'answer_area' since it is no longer used.
mark-fitzgerald
committed

Commits on Feb 25, 2025

[lc-1482 .content-editor-code] Add styles that are potentially still used by legacy code in Webapp.
mark-fitzgerald
committed