Document root property for navigation groups

[mintlify]

Added documentation for the new root property that allows groups to have a dedicated landing page. When set, clicking the group title navigates to the root page instead of just expanding/collapsing the group.

Changes

• Updated Groups section to list root as an optional field
• Added example showing root property usage in the main Groups code sample
• Created new "Root page" subsection explaining the feature with practical examples

Generated from feat: "root" in groups @lawreka

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Note

Low Risk
Documentation-only changes that add a new optional configuration field description and examples; no runtime or security-sensitive code is modified.

Overview
Documents the new optional root property on navigation groups, allowing a group title click to navigate to a designated landing/overview page.

Updates the groups schema description and main JSON example to include root, and adds a dedicated Root page section with an additional example and behavior notes (active highlight + group remains expanded).

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