docs: update URLs for omnisite

[benmccann]

These URLs won't work yet, but might as well update them now so that we don't forget later.

I noticed this on https://npmjs.com/package/sv that we're publishing a homepage link that soon will be outdated 😄

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[pkg-pr-new]

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pnpm add https://pkg.pr.new/sveltejs/cli/sv@93

commit: 4bfc9d8