chore: update sv package description

[ghostdevv]

I noticed this is a little outdated since it only references SvelteKit, so I updated it with the same line from the sv README.md

cli/packages/sv/README.md

Line 3 in 88d5c9d

A command line interface (CLI) for creating and maintaining [Svelte](https://svelte.dev) applications. Just run:

[changeset-bot]

⚠️ No Changeset found

Latest commit: fc83ed4

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[pkg-pr-new]

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npx https://pkg.pr.new/sveltejs/cli/svelte-migrate@852

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commit: fc83ed4