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

[jost-s]

depends on #547

resolves #531

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

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[veeso]

This at lib.rs is the only thing missing I guess:

line 37

//! # Custom Templates
//!
//! The scaffolding tool comes with 6 built-in templates:
//!
//! - Vue (with TypeScript)
//! - Svelte (with TypeScript)
//! - Lit (with TypeScript)
//! - React (with TypeScript)
//! - Vanilla
//! - Headless (no ui) - [best for building headless hApps or using a unsupported ui framework without having to create a custom template]

[jost-s]

//! The scaffolding tool comes with 6 built-in templates:

This line is in the file and needs to be changed, the list is updated though. You must be looking at a different branch.

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✔️ 7fd14c9 - Conventional commits check succeeded.