feat: compact examples + cli for examples

[userquin]

This PR compacts the examples to reduce maintenance to a minimum.

The changes made are:

• removed react-basic and react-basic-inject-manifest examples, removed also scripts from root
• removed svelte-basic and svelte-basic-inject-manifest examples, removed also scripts from root
• removed vue-basic and vue-basic-inject-manifest examples, removed also scripts from root
• added custom service worker (injectManifest) on react-router, svelte-routify and vue-router, added also scripts on root
• added service worker periodic sw updates for generateSW strategy on react-router, svelte-routify and vue-router
• updated vue scripts on root, now contains :vue: in the name
• docs: updated Available Example Projects on examples entry
• docs: updated vue, react and svelte examples entries

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[userquin]

Once approved and merged I'll include the cli to run the examples.

EDIT: since the changes are substantial, I'll change this PR to draft to include the cli for examples.

[antfu]

🔥