docs: rename Network Routes to Routes, deprecate, and relocate Browser Client Architecture

[SunsetDrifter]

Aligns the docs with the updated dashboard navigation, where the former Network Routes feature now appears simply as Routes under Network Routing and is being wound down in favor of Networks.

Changes

Routes rename + deprecation

• Sidebar entry Network Routes → Routes (NavigationDocs.jsx) and the page H1.
• Added a deprecation note at the top of the Routes page: every use case except exit nodes has moved to Networks. Revised the body framing (removed the "will continue to be maintained" / coequal wording) so the page reads consistently as deprecated.
• The URL slug /manage/network-routes is unchanged, preserving existing redirects and external links.

Relocate Browser Client Architecture

• Moved /about-netbird/browser-client-architecture → /manage/peers/browser-client/architecture.
• Turned the flat Browser Client Peers entry into a collapsible section with Overview + Architecture; removed the old entry from the ABOUT section.
• Added a permanent redirect from the old path and updated the two cross-links (introduction tile, browser-client page).

Diagram box fix (scoped)

• Shrunk the Architecture ASCII-diagram boxes on both site-to-site pages to fit their content (w-fit) instead of spanning the full column. The same full-width-box issue exists elsewhere in the docs and will be addressed separately at the component level.

Verification

Confirmed against the local dev server: renamed/moved pages return 200, the deprecation note and "Routes" heading render, the redirect target resolves, and the nav reflects the new structure.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7d2fa888-2276-4af8-9e4b-ebb358a139bc

📥 Commits

Reviewing files that changed from the base of the PR and between b344041 and 42d8532.

📒 Files selected for processing (8)

• next.config.mjs
• src/components/NavigationDocs.jsx
• src/pages/introduction.mdx
• src/pages/manage/network-routes/index.mdx
• src/pages/manage/network-routes/use-cases/site-to-site.mdx
• src/pages/manage/networks/use-cases/site-to-site.mdx
• src/pages/manage/peers/browser-client.mdx
• src/pages/manage/peers/browser-client/architecture.mdx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/routes-rename-and-browser-client-nav

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