Document root property for groups

[mintlify]

Added documentation for the new root property in navigation groups. This property allows groups to have a dedicated landing page that users navigate to when clicking the group title.

Changes

• Updated Groups section to list root as an optional field
• Added root property example to the main groups configuration
• Created new "Root page" subsection explaining usage and behavior

Generated from feat: "root" in groups @lawreka

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Note

Low Risk
Documentation-only change with no runtime or data-handling impact.

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

Updates the groups schema description and examples to include root, and adds a Root page subsection describing expected sidebar behavior (navigation + active highlighting) when root is set.

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