Add ?url to CSS import in Tailwind docs

[joonmo-you]

The official documentation provided by Tailwind suggests adding a query string at the end of the path to the Tailwind file.
A Remix application doesn't properly import the Tailwind file without the query string.

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[changeset-bot]

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[remix-cla-bot]

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

[markdalgleish]

Thanks for the PR!