Revert "Revert "docs: create IDE Extensions tab with Customize and Reference sections""

[sestinj]

Reverts #9680

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Continue Tasks

Status	Task	Actions
▶️ Queued	Update docs on PR	View
▶️ Queued	Optimize Website Performance	View

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Summary by cubic

Restores the docs redesign: adds a dedicated IDE Extensions tab and moves Customize and Reference into it. Removes the VS Code Settings page and adds redirects to keep old links working.

• Refactors
  • Adds IDE Extensions tab with Getting Started and Features (Agent, Chat, Autocomplete, Edit).
  • Moves Customize and Reference groups under IDE Extensions; updates icons and grouping.
  • Removes standalone Customize and Reference tabs; repositions Help group.
  • Deletes ide-extensions/settings.mdx and removes its link from customize/overview.
  • Adds redirects from /ide-extensions/settings and /customization/settings to /customize/overview.

^{Written for commit 9f32e38. Summary will update on new commits.}

[github-actions]

✅ Review Complete

Code Review Summary

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[cubic-dev-ai]

No issues found across 3 files