SvelteKit integration

[SvelteKit](https://kit.svelte.dev) is heading toward the first release.

It uses `adapters` to deploy on various serverless environments: https://kit.svelte.dev/docs#adapters (already supported: Vercel, Begin, CloudFlare, Netlify). The productivity, dev experience and output quality is pretty impressive.

It seems that it would be quite possible (and interesting) to also build for an "Azure static web apps" target (maybe the `adapter-node` would do the job, it seems a good starting point anyway).

I don't have the time right now to look into this (maybe in the future), but it may worth a closer look.

Be careful: the `adapter` part of SvelteKit is still moving (but the pace has decreased a lot).