Update web editor overview with recent features

[mintlify]

Updated the web editor overview page to include recent features from the latest changelogs. Added documentation for live preview, visual navigation editing, configuration options, unused files section, shareable preview links, and the ability to work without GitHub sign-in.

Files changed:

• editor/index.mdx - Updated key features section with 6 new capabilities

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Note

Refreshes editor/index.mdx to reflect recent editor capabilities.

• Adds key features: Live preview, Visual navigation editing, Configuration options (edit docs.json settings in-app), Unused files section, Shareable preview links, and No GitHub sign-in required
• Enhances Built-in media manager description to mention drag-and-drop support
• Keeps existing structure and other content unchanged

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