refactor!: delete react, lit and vue as selectable ui templates

[jost-s]

depends on #533

resolves #531

• hello_world example can only be scaffolded with vanilla template.
• forum can only be scaffolded with svelte template.

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🧪 Generate unit tests (beta)

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• Commit unit tests in branch refactor/provide-svelte-as-only-ui-framework

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[ThetaSinner]

Great!

[mattyg]

I was assuming we would drop vanilla as well so there was only a single set of templates for generating a UI. Was that not the intention?

[jost-s]

I dropped vanilla at first as well, but that would mean that the hello-world example would be dropped too, because that only works with vanilla JS.

In the end I did what the issue said. Happy to remove vanilla as well as a follow-on.

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✔️ 2d7e873 - Conventional commits check succeeded.