Document directory listing for navigation groups

[mintlify]

Summary

Adds documentation for the new directory property on navigation groups, which shipped in mintlify/mint#6933. This feature lets users automatically render a directory listing of child pages on a group's root page, available in "accordion" or "card" styles with recursive inheritance through nested groups.

Changes

• organize/navigation.mdx: Added a "Directory" subsection under Groups explaining the property, its values ("none", "accordion", "card"), inheritance behavior, and a configuration example.
• organize/settings-structure.mdx: Expanded the navigation.groups ResponseField with all group properties including directory.
• organize/settings-reference.mdx: Added property details for navigation.groups including the directory field.

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Note

Low Risk
Documentation-only updates with no runtime, schema-validation, or behavior changes in the product.

Overview
Adds documentation for a new navigation.groups[].directory property that renders a child-page directory listing on a group’s root page, including supported styles ("none", "accordion", "card") and inheritance/requirements.

Updates the docs.json schema docs (settings-reference.mdx and settings-structure.mdx) to include directory in the navigation.groups shape and field descriptions, with a link back to the new Navigation section.

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[ethanpalm]

Closing as duplicate of #5200. #5200 is the in-progress directory listings PR that will be reviewed when ready.