fix(sidebar): align sections with gears-rust content restructure

[Artifizer]

Replaces the stale nine-section sidebar skeleton (Getting Started, Guides, Architecture, Reference, Examples, Contributing) with the six sections that match the current docs/web-docs directories in gears-rust: Introduction, Capabilities, Build with Gears, CLI, Concepts, Contribute.

The previous config autogenerated from directories that no longer exist, producing empty/broken sidebar groups and hiding the new sections (Capabilities, Build with Gears, Contribute).

Per-page order comes from each page's sidebar.order frontmatter; the CLI section is synced from cargo-gears.

Summary by CodeRabbit

• Documentation
  • Updated the documentation sidebar navigation to reflect the current table of contents.
  • Added dedicated sections for “Capabilities” and “Build with Gears.”
  • Consolidated contribution content under a single “Contribute” section.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ba211165-0cc9-471b-9053-f541ac89f95b

📥 Commits

Reviewing files that changed from the base of the PR and between 438cb14 and 9d9c0e6.

📒 Files selected for processing (1)

• astro.config.mjs

📝 Walkthrough

Walkthrough

The Astro sidebar configuration now follows the documentation TOC, adds autogenerated Capabilities and Build with Gears sections, and replaces prior contribution entries with a Contribute section sourced from the contribute directory.

Changes

Sidebar navigation

Layer / File(s)	Summary
Update sidebar sections astro.config.mjs	Replaces the previous sidebar skeleton with TOC-derived ordering, adds autogenerated Capabilities and Build with Gears sections, and consolidates contribution navigation under Contribute.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the sidebar reorganization and content restructure reflected in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sidebar-sections-restructure

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