docs: how-to SSR guide

Add a comprehensive "How to Set Up Server-Side Rendering (SSR)" guide to
provide practical, step-by-step instructions and address feedback from
PR #4703.

The previous PR #4703 aimed to add an SSR setup guide but had concerns
regarding overlap with an existing conceptual SSR guide and specific
technical implementation details (e.g., streaming SSR, Vite config).
This PR addresses those concerns by creating a distinct, practical
"how-to" guide with complete code examples, troubleshooting, and a clear
recommendation for TanStack Start, while ensuring it complements the
existing theoretical guide.

---

[Open in
Web](https://cursor.com/agents?id=bc-8555f196-638f-4bec-90a4-5eac52b5918a)
• [Open in
Cursor](https://cursor.com/background-agent?bcId=bc-8555f196-638f-4bec-90a4-5eac52b5918a)

Learn more about [Background
Agents](https://docs.cursor.com/background-agent/web-and-mobile)

Co-authored-by: Cursor Agent <[email protected]>

Author: tannerlinsley

docs/router/framework/react/how-to/README.md

@@ -11,6 +11,7 @@ This directory contains focused, step-by-step instructions for common TanStack R
 
 - [Install TanStack Router](./install.md) - Basic installation steps
 - [Deploy to Production](./deploy-to-production.md) - Deploy your app to hosting platforms
+- [Set Up Server-Side Rendering (SSR)](./setup-ssr.md) - Implement SSR with TanStack Router
 
 ## Using These Guides
 

docs/router/framework/react/how-to/deploy-to-production.md

@@ -432,8 +432,9 @@ Before deploying, ensure you have:
 
 After deployment, you might want to:
 
-<!-- TODO: Uncomment as how-to guides are created
 - [How to Set Up Server-Side Rendering (SSR)](./setup-ssr.md)
+
+<!-- TODO: Uncomment as how-to guides are created
 - [How to Optimize Performance](./optimize-performance.md)
 - [How to Set Up Analytics](./setup-analytics.md)
 -->