docs: solid-start example new `app.config.ts` file

[talensjr]

Describe the bug

The solid-start example now uses a app.config.ts file instead of vite.config.ts file from vinxi: 0.3.6 and examples are now using vinxi: 0.3.8 so the dev server does error out.

Your minimal, reproducible example

https://stackblitz.com/github/tanstack/query/tree/main/examples/solid/solid-start-streaming?embed=1&theme=dark&preset=node

Steps to reproduce

1. The server automatically start.
2. It will throw an error related to not finding the new file.

Expected behavior

Expected dev server to run correctly.

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

Not platform related.

Tanstack Query adapter

solid-query

TanStack Query version

v5

TypeScript version

No response

Additional context

No response

[TkDodo]

@ardeora FYI