## Summary
The merge conflict resolution from PR #16705 incorrectly discarded the
new documentation structure changes. This PR updates the navigation JSON
files (the correct approach) to restore the intended changes.
## Changes restored
- New 'Capabilities' and 'How-Tos' subgroups organization
- Renamed sections (e.g., 'Getting Started' → 'Discover Twenty')
- New sections: Data Migration, Calendar & Emails, AI, Views &
Pipelines, Dashboards, Permissions & Access, Billing
- Reorganized Developers section with Extend, Self-Host, and Contribute
groups
## Files updated
- `navigation/base-structure.json`
- `navigation/navigation-schema.json`
- `navigation/navigation.template.json`
## Context
PR #16705 was merged but the merge conflict was incorrectly resolved,
causing all the structural changes to be lost. The previous fix (PR
#16741) updated docs.json directly, but the correct approach is to
update the navigation JSON files instead. This PR properly restores
those changes from the final commit of PR #16705
(`c856e0d598a0056c2bdaf528502e08261daf7c7c`).
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