chore: move playground

[benmccann]

Match the directory structure we're using in the kit and Svelte 5 code bases

[changeset-bot]

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Latest commit: b1c182c

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[gtm-nayan]

pnpm-workspace.yaml and lockfile needs to be updated as well

[MrHBS]

Where is the svelte 5 codebase at :D ?

[benmccann]

Not ready to share yet 😉 Just experimenting for now

[noy4]

(report)
playground dev command fails.
I think svelte paths in playgrounds/basic/start.js needs to be updated

[benmccann]

thanks. sent a PR here: #9139