Use Tailwind v4's CSS-based config

[alexanderson1993]

This removes yet another file (tailwind.config.ts) and fits more closely with the intended way of configuring Tailwind v4.

[changeset-bot]

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Latest commit: f5d3d6e

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[remix-cla-bot]

Hi @alexanderson1993,

Welcome, and thank you for contributing to React Router!

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[remix-cla-bot]

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

[brookslybrand]

Perfect! Thank you so much