Update to work with 'npm install'

[srid]

Also documented in README

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[benmccann]

There are official docs now: https://kit.svelte.dev/docs

[srid]

Yea, I was just trying to get this running locally so as to understand how files can be used as "data" to render HTML (whilst continuing to support static site generation and dev server's hot reload). In this repo, .svx files are used to render slugs.