add .vinxi build folder to .gitignore

[ricardo-devis-agullo]

When using the tool to create a solid start project, the .gitignore file doesn't include .vinxi, but that folder is generated when you run npm run dev. This adds it to the .gitignore, so git doesn't try to track it when you build the project.

Issue mentioned by me here https://github.com/solidjs/solid-start/issues/1340

Before I found this other repo :)

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[Tommypop2]

Thanks!