docs: include new SvelteKit options

[userquin]

Add the new kit option latestKit and the corresponding warning: https://github.com/vite-pwa/sveltekit/pull/32.

/cc @benmccann should we release a minor (breaking changes: check the warning on the page)?

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[benmccann]

honestly, I'd just bump the peerDep to require SvelteKit > 1.3.0 and skip the extra complication of supporting both

[userquin]

Ok, so breaking changes updating peer to use 1.3.1+

[userquin]

Add process.env.NODE_ENV hint when using injectManifest and workbox packages.