Switch navigation to horizontal tabs

[qdequele]

Summary

• Replace vertical anchor-based sidebar navigation with horizontal tab navigation in docs.json
• Rename "API Reference" tab to "Reference"

Test plan

• Run mintlify dev and verify the three tabs (Learn, Reference, Guides) appear as horizontal tabs at the top
• Verify sidebar content under each tab remains unchanged

This PR is required for adding #3497 and #3496

Fixes #3489

[coderabbitai]

📝 Walkthrough

Walkthrough

The docs.json configuration file undergoes a structural refactoring of its navigation schema. The top-level property "anchors" is renamed to "tabs" within version definitions. Concurrently, nested "anchor" fields are renamed to "tab", and "icon" fields are removed from tab entries across the Learn, API Reference, and Guides sections.

Changes

Cohort / File(s)	Summary
Navigation Schema Restructuring docs.json	Renamed "anchors" to "tabs" at version level; renamed individual "anchor" to "tab" within each tab; removed "icon" field from tab definitions across Learn, API Reference, and Guides sections.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 Tabs now organize the warren so neat,
Old anchors retire—their mission complete.
Icons hop off, our structure refined,
Navigation blooms with a cleaner design! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Switch navigation to horizontal tabs' directly and clearly describes the main change: converting the navigation structure from anchors to tabs in docs.json.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch switch-to-horizontal-tabs

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[CaroFG]

LGTM!