docs: add Remix integration page

[JoshuaKGoldberg]

Per #1266 (reply in thread), just links to the Remix docs off-site and the Vite docs on-site.

I'm not sold on the phrasing of the page but figured I'd just ask for help. 😄

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[mrm007]

Thanks @JoshuaKGoldberg! I've tweaked the wording a bit.