docs: fix API tab 404 by removing broken reference/index links

[geonhwiii]

Summary

• Fixes the docs API tab 404 reported in Documentation API Link not Found #2226 by removing sidebar entries that pointed at reference/index (and the framework equivalents).
• Those links resolve to https://tanstack.com/form/latest/docs/reference/index, which currently 404 page.
• After this change, the API tab lands on the first concrete reference page that already works (e.g. FieldApi / framework-specific APIs).

Fixes #2226

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Note

If docs/reference/index.md and docs/framework/*/reference/index.md should actually be shown in the docs UI, more changes will likely be needed.

Please feel free to suggest edits! Thanks!

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✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[coderabbitai]

📝 Walkthrough

Walkthrough

The documentation API navigation removes the top-level JavaScript Reference entry and framework-specific Reference index entries for React, Preact, Vue, Solid, Lit, and Angular.

Changes

API navigation cleanup

Layer / File(s)	Summary
Remove reference index entries docs/config.json	Removes intermediate JavaScript and framework Reference navigation items while retaining the existing API classes, functions, variables, and types.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Removing the broken reference/index sidebar entries addresses #2226 by routing the API tab to working docs pages instead of 404s.
Out of Scope Changes check	✅ Passed	The change is limited to docs navigation cleanup and stays within the stated goal of fixing the API tab 404.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title clearly matches the main change: removing broken API sidebar links to fix the docs 404.
Description check	✅ Passed	The description covers the required changes, checklist, and release impact, with only minor heading differences from the template.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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