Add admin dashboard user permissions documentation

[mintlify]

Added comprehensive documentation for admin dashboard user permissions covering Members, Admins, and Owners roles with their specific capabilities and management instructions. Updated navigation to include the new user permissions page in the User Manual section.

[greptile-apps]

Your free trial has ended. If you'd like to continue receiving code reviews, you can add a payment method here.

[greptile-apps-staging]

Greptile Summary

This PR adds comprehensive documentation for admin dashboard user permissions, introducing a new MDX file that explains the three-tiered permission system in Greptile's platform. The documentation defines Members, Admins, and Owners roles with their specific capabilities in a clear hierarchical structure. Members can access repositories, integrations, and analytics; Admins gain additional user role management and billing access; while Owners have the highest level of access including the ability to delete organizations.

The new documentation file follows standard Mintlify formatting with proper frontmatter, uses appropriate warning and note components to highlight critical operations like organization deletion, and provides step-by-step instructions for modifying user permissions. The PR also updates the navigation configuration in docs.json to include the new page in the User Manual section, making it easily discoverable for administrators who need to understand access control within their organizations.

This change integrates well with the existing documentation structure, positioning the user permissions guide early in the User Manual section where it would be most useful for new administrators setting up their teams.

Changed Files

Filename	Score	Overview
admin-dashboard/user-permissions.mdx	5/5	New comprehensive documentation file defining three-tiered user permission system (Members, Admins, Owners) with clear capabilities and management instructions
docs.json	5/5	Added new user permissions page to User Manual navigation section and removed trailing newline

Confidence score: 5/5

• This PR is safe to merge with minimal risk as it only adds documentation without affecting any production code
• Score reflects well-structured documentation following established patterns and simple navigation configuration changes
• No files require special attention as both changes are straightforward documentation additions

_{2 files reviewed, no comments}

_{Edit Code Review Bot Settings | Greptile}