[Docs]: Update Some Router Docs

[LadyBluenotes]

• Update Overview and Quick Start pages
• Created an "Installation Guide" section for all install guides

Summary by CodeRabbit

• Documentation
  • Consolidated installation content into a new Installation Guides section (React and Solid), and rewrote Quick Starts toward a CLI-first flow.
  • Expanded React FAQ with reasons to choose TanStack Router and key feature deep-dives; clarified relative navigation edge cases.
  • Updated SSR docs to reference defaultRenderHandler; streamlined overviews and comparisons; removed legacy comparison/how-to pages and tutorials.
  • Reorganized Start docs paths (…/guide/…), added Solid framework entries, and added “Migrate from Next.js” (React).
• Chores
  • Bumped @tanstack/react-router-devtools, @tanstack/router-plugin, and @tanstack/react-start versions across example projects.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Docs were heavily reorganized: navigation configs updated, many React “How-To” pages removed, new consolidated Installation Guides added, multiple React/Solid docs revised (FAQs, quick-starts, SSR API rename in docs, overviews), Start docs paths normalized under guide/, and examples bumped TanStack dependency patch versions.

Changes

Cohort / File(s)	Summary
Router Docs Navigation Restructure docs/router/config.json	Reorganized nav: removed scattered install/migrate/how-to nodes; added top-level “Installation Guides” for React/Solid; pruned redundant items.
React Router Docs Removals (How-To, Comparisons, Install) docs/router/framework/react/how-to/*, docs/router/framework/react/how-to/drafts/*, docs/router/framework/react/installation.md, docs/router/framework/react/comparison.md	Deleted comprehensive How-To guides (auth, SSR, testing, search params, integrations, migrations) and comparison/installation pages.
React Router Docs Additions/Edits docs/router/framework/react/faq.md, .../guide/navigation.md, .../guide/ssr.md, .../installation/manual.md, .../installation/with-esbuild.md, .../overview.md, .../quick-start.md	Added/expanded FAQ; added Manual Setup; updated navigation notes; renamed SSR helper in examples (defaultRenderHandler); retitled ESbuild page; condensed overview; shifted quick-start to CLI-first.
Solid Router Docs Alignment docs/router/framework/solid/installation/manual.md, .../overview.md, .../quick-start.md	Retitled to “Manual Setup”; adjusted refs/replacements; quick-start rewritten to CLI-focused flow.
Start Docs Config Restructure docs/start/config.json	Added React “Migrate from Next.js”; added Solid framework block; moved many items under framework/.../guide/...; removed Tutorials section.
Start React Docs Edits docs/start/framework/react/build-from-scratch.md, .../getting-started.md, .../guide/authentication.md, .../guide/middleware.md, .../guide/routing.md, .../guide/server-functions.md, .../guide/spa-mode.md, .../overview.md, .../quick-start.md	Updated links/paths; simplified text; adjusted middleware/server-functions references; renamed Vite plugin usage to tanstackStart; expanded overview and quick-start.
Start Solid Docs Edits docs/start/framework/solid/environment-functions.md, docs/start/framework/solid/guide/*, docs/start/framework/solid/overview.md, docs/start/framework/solid/quick-start.md	Moved/added Solid guide refs; updated replace mappings (React→SolidJS); removed old env-functions doc; streamlined overview; expanded quick-start.
Examples: Dependency Version Bumps examples/react/*/package.json, examples/react/router-monorepo-*/packages/*/package.json	Bumped @tanstack/react-router-devtools, @tanstack/router-plugin, and @tanstack/react-start to 1.132.51 across many examples; no code changes.

Sequence Diagram(s)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related issues

• Proposal: Add Comprehensive Testing Documentation to TanStack Router #4569 — This PR removes the React testing How-To doc, intersecting with the issue’s goal to add comprehensive testing docs.

Possibly related PRs

• Docs(Router-SSR): Resolve typos #5425 — Touches the same SSR docs example by renaming defaultRenderToString → defaultRenderHandler.
• Docs(Relative Navigation): add extra context around the from location #5424 — Modifies the same navigation guide to clarify from-location and pathless layout behavior.
• docs: Move the streaming docs to the "Getting started" section, because TanStack Start doesn't have a "Guides" section yet #5399 — Reorganizes Start docs links/paths similarly to this PR’s guide path updates.

Suggested reviewers

• schiller-manuel
• brenelz
• birkskyum

Poem

I hopped through docs, a tidy spree,
Old trails pruned, new paths set free.
Install maps bloom, guides align,
Solid and React, now neatly in line.
Patch-bumped carrots for examples bright—
Thump-thump! Our routes read right. 🥕✨

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d3cbb23 and 8751c3a.

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• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

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