docs: add How To section to navigation sidebar

[cyphercodes]

The how-to guides in docs/router/how-to/ were not accessible from the navigation sidebar, as reported in #6801.

This PR adds a new 'How To' section after ESLint and before Router Examples, making all 20+ guides discoverable.

Fixes #6801

Summary by CodeRabbit

• Documentation
  • Added a new "How To" section with guides for installation, setup, authentication, testing, debugging, deployment, environment variables, and UI integrations with support for React and Solid frameworks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 45752e9c-fd1f-4b67-9074-9944745c531f

📥 Commits

Reviewing files that changed from the base of the PR and between 21bd992 and 52102fa.

📒 Files selected for processing (1)

• docs/router/config.json

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📝 Walkthrough

Walkthrough

A new "How To" section was added to the TanStack Router documentation navigation configuration with structured child items covering various guides including setup, testing, deployment, and framework integration.

Changes

Cohort / File(s)	Summary
Documentation Navigation docs/router/config.json	Added "How To" top-level section to navigation with 17+ child items (Overview, Install, authentication/RBAC/SSR/testing setup, Search Params, file-based routing tests, Debugging, Deployment, Environment Variables, UI integrations, React Router migration) and framework entries for React and Solid, all mapping to corresponding documentation paths.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 The docs were hiding, lost from sight,
A "How To" path, now shining bright!
From auth to tests, deployment's way,
Our hopping friends can learn and play! ✨

🚥 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 and concisely summarizes the main change: adding a 'How To' section to the navigation sidebar in the documentation.
Linked Issues check	✅ Passed	The PR successfully addresses all coding requirements from issue #6801: adds a 'How To' section to the sidebar navigation after ESLint and before Router Examples, making the 20+ how-to guides discoverable.
Out of Scope Changes check	✅ Passed	All changes in the PR are scoped to the objective: only the docs/router/config.json file was modified to add the 'How To' navigation section with no unrelated alterations.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[schiller-manuel]

those howtos are not ready for consumption

[cyphercodes]

@schiller-manuel Thanks for the feedback! Could you clarify what needs to be done to make the How To section ready? I'm happy to make any necessary changes.