Update dependencies and refactor DeepSeek Sparse Attention page for dynamic content loading

- Added `rehype-katex` and `remark-math` for enhanced markdown rendering capabilities, enabling support for mathematical expressions.
- Refactored the DeepSeek Sparse Attention page to dynamically load markdown content, improving content management and user experience.
- Implemented a loading state while fetching content to enhance user feedback during data retrieval.
- Updated the MarkdownRenderer component to include new plugins for improved formatting and presentation of mathematical content.

Author: vukrosic