Refactor math skills and update CSS styles; adjust tests for new skill identifiers
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d05b676
- Updated math_skills.py to reflect changes in the teaching schedule and skill prerequisites.
- Modified CSS variables for improved styling consistency.
- Adjusted test_answer_browser.py and related test files to use new skill identifiers (e.g., a_30_side instead of g_triangle_area).
- Added documentation for the 9th-grade teaching schedule.
