Important

This PR updates documentation for Roo Code's modes, introduces new experimental features, and adds release notes for recent versions, along with updating the sidebar configuration.

• Documentation Updates:
  • Updated using-modes.md to reflect changes in mode descriptions and image paths.
  • Enhanced custom-modes.mdx with detailed explanations of mode properties and configuration methods.
  • Added new experimental feature documentation for intelligent-context-condensation.md and power-steering.md.
• Release Notes:
  • Added release notes for versions 3.16.4, 3.16.5, 3.16.6, 3.17.0, and 3.17.
  • Updated index.md to include new version links.
• Sidebar Configuration:
  • Updated sidebars.ts to include new experimental features and update notes for recent versions.

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