CLI/Svelte: Revert template stories from svelte-native to CSF

[shilman]

Issue: N/A

What I did

Revert template stories from svelte-native to CSF

• Story Store v7 compatibility
• Consistency with rest of documentation & storybook idioms
• Move towards possible future deprecation of svelte-native format

How to test

npx degit sveltejs/template new-svelte-test
cd new-svelte-test/
~/path/to/storybook/lib/cli/bin/index.js init

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• nx run-many --target=prepare --all --parallel --max-parallel=15

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[jonniebigodes]

@shilman ran it locally against my Storybook set up and it's working great in development/publish mode. Feel free to merge it when you're able.