Refactor DeepSeek Sparse Attention page for improved content structure and clarity

- Updated the layout to dynamically load markdown content, enhancing content management and readability.
- Consolidated technical details into a more structured format, including sections on the Lightning Indexer and performance results.
- Removed redundant visual elements and tooltips to streamline the user experience while maintaining essential information.
- Enhanced the overall presentation to better highlight the key innovations and implications of the DeepSeek Sparse Attention model.

Author: vukrosic