docs: Restructure navigation with new Customize tab

[BekahHW]

Summary

This PR restructures the documentation navigation to improve discoverability and organization of customization-related content.

Changes

1. New 'Customize' Tab

• Created a new top-level 'Customize' tab in the documentation
• Added comprehensive landing page at customize/index.mdx that serves as a central hub for all customization topics
• Landing page includes sections for:
  • Models & Model Providers
  • Rules & Prompts
  • MCP Tools & Model Roles
  • Deep Dives & Reference
  • Getting Started guides

2. Updated IDE Extensions Tab

• Removed 'Customize Overview' from the 'Getting Started' section (was previously after Quick Start)
• Streamlined the IDE Extensions tab to focus on extension-specific features

3. Enhanced Documentation Tab

• Added 'IDE Extension' group with link to installation page
• Improves discoverability of IDE extensions from the main Documentation tab

4. Updated Main Index Page

• Added helpful callout after IDE Extensions section:

  "Learn more about extension features and how to customize →"

• Provides clear navigation path for users wanting to explore features or customization

Benefits

• Better Organization: Separates high-level customization concepts into their own dedicated tab
• Improved Discoverability: Users can now easily find all customization options in one place
• Clearer Navigation: The customize landing page acts as a comprehensive guide similar to the guides overview
• Reduced Clutter: IDE Extensions tab is now focused on extension-specific content

Testing

• Verified all links are functional
• Confirmed navigation structure matches the intended hierarchy
• Landing page content comprehensively covers all customize/* paths

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This task was co-authored by bekah-hawrot-weigel and Continue.

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Summary by cubic

Adds a top-level Customize tab with a central landing page to make all customization docs easy to find. Streamlines IDE Extensions and adds a clear link from the home page.

• New Features

  • New Customize tab with landing page at customize/index.mdx that hubs Models, Providers, Rules, Prompts, MCP Tools, Model Roles, Deep Dives, and Reference.

• Refactors

  • Navigation: removed “Customize Overview” from Getting Started, focused IDE Extensions on extension content, and added an “IDE Extension” group in the Documentation tab.
  • Home page: added a callout linking to extension features and the Customize hub.
  • Guides: fixed a broken link in “Run Agents Locally” to point to Create and Edit Cloud Agents.

^{Written for commit cfbefc1. Summary will update on new commits.}

[github-actions]

✅ Review Complete

Code Review Summary

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[cubic-dev-ai]

1 issue found across 3 files

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="docs/customize/index.mdx">

<violation number="1" location="docs/customize/index.mdx:98">
P2: Embedded image points to non-existent asset (`/images/customize/images/configure-continue-a5c8c79f3304c08353f3fc727aa5da7e.png`), likely rendering a broken image.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}