Add root pages for groups with index/overview pages

[ethanpalm]

Documentation changes

See title

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Low Risk
Navigation-only documentation config changes; main risk is misconfigured paths causing broken sidebar routing.

Overview
Updates docs.json navigation to define explicit root pages for groups that have an index/overview entry (e.g., Web editor, Agent, Components, /docs subpath, and Integrations subsections like Analytics/Support/Privacy). This ensures group headers route to the intended landing page instead of relying on implicit behavior.

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