Important

Adds documentation for the .rooignore feature and updates the sidebar to include it.

• Documentation:
  • Adds docs/features/rooignore.md to document the .rooignore feature, explaining its purpose, usage, pattern syntax, tool interactions, limitations, and user experience.
• Sidebar:
  • Updates sidebars.ts to include the .rooignore documentation under the 'Features' category.

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