chore: remove preview site

[Rich-Harris]

i don't think we need this any more?

[changeset-bot]

⚠️ No Changeset found

Latest commit: bc2b2a4

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[Rich-Harris]

preview: https://svelte-dev-git-preview-svelte-14428-svelte.vercel.app/

this is an automated message

[github-actions]

Playground

pnpm add https://pkg.pr.new/svelte@14428

[dummdidumm]

We don't, except we want the documentation to be easily visible locally still in order to port some of it over

[benmccann]

There's also a bunch of stuff in #13818 that can be deleted

[Rich-Harris]

what do we want to port over, specifically? would be good to do that so we can merge this

[Rich-Harris]

Just gonna go ahead and merge this, because it's causing continued confusion