docs: Outline top how-to guides for TanStack Start (#4816)

Create a detailed plan for TanStack Start how-to guides, prioritizing
based on user issues and dependencies.

This plan outlines over 20 new how-to guides, organized by logical
dependencies and explicitly addressing common pain points found in
GitHub issues, particularly around server functions and deployment.

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[Open in
Web](https://cursor.com/agents?id=bc-58c1c95a-be49-4ad5-8bd7-80ad78fbc4e7)
• [Open in
Cursor](https://cursor.com/background-agent?bcId=bc-58c1c95a-be49-4ad5-8bd7-80ad78fbc4e7)
• [Open Docs](https://docs.cursor.com/background-agent/web-and-mobile)

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

Author: tannerlinsley