docs(examples): add vanilla-extract example

[markdalgleish]

Thanks for all your amazing work on Remix 🙏

This adds an example using vanilla-extract and Sprinkles, compiled in a separate tsup process and then imported into the Remix app.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 416fb12

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[remix-cla-bot]

Hi @markdalgleish,

Welcome, and thank you for contributing to Remix!

Before we consider your pull request, we ask that you sign our Contributor License Agreement (CLA). We require this only once.

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Thanks!

- The Remix team

[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[machour]

Thank you!