[Fix Accessibility Bug] Refactor code.js to improve syntax highlighting colors (#1305)
## WHAT This pull request includes changes to improve the syntax highlighting in the `src/mdx/code.js` file by introducing a color mapping for different token types and simplifying the code structure. Improvements to syntax highlighting: * [`src/mdx/code.js`](diffhunk://#diff-f3f4e897983cba6337e020c78ef03c356c88f8868bcd19c465eb3c07e8b96625R46-R50): Added a `colorMap` object to define custom colors for specific token types such as comments, parameter variables, and functions. Code simplification: * [`src/mdx/code.js`](diffhunk://#diff-f3f4e897983cba6337e020c78ef03c356c88f8868bcd19c465eb3c07e8b96625L116-R128): Refactored the `Code` component to use the `colorMap` for setting token colors, simplifying the logic for applying styles to tokens. ## WHY ### BEFORE <img width="835" alt="screen shot before" src="https://github.com/user-attachments/assets/5eabe1a8-58f2-4aea-8be2-85c378d47129"> <img width="229" alt="colour red before" src="https://github.com/user-attachments/assets/6fa14348-e459-4adb-8d40-3b82eeb27fa4"> <img width="229" alt="colour blue before" src="https://github.com/user-attachments/assets/8875765f-c878-4081-8055-de51c2af162d"> ### AFTER <img width="835" alt="screen shot after" src="https://github.com/user-attachments/assets/1a9ab2f5-4f65-4f78-840e-b9205e5ca6ca"> <img width="229" alt="colour red after" src="https://github.com/user-attachments/assets/769626c3-358f-4c97-a474-45c6a313c008"> <img width="229" alt="colour blue after" src="https://github.com/user-attachments/assets/474b603f-8b72-4c08-994b-26f6986bdb5d">