Migrate to SvelteKit

[frangio]

This site is currently using a custom Svelte setup. This PR migrates it to a more standard SvelteKit setup. Some works is still needed.

[socket-security]

New, updated, and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
vite	4.4.9	eval, network, filesystem, shell, environment	+46	418 MB	vitebot
@sveltejs/adapter-auto	2.1.0	None	+2	163 kB	svelte-admin
svelte-check	3.5.2	None	+0	8.67 MB	svelte-language-tools-deploy
autoprefixer	10.4.15...10.4.16	None	+8/-4	5.08 MB	ai

🚮 Removed packages: @rollup/plugin-alias@5.0.0, @rollup/plugin-commonjs@25.0.4, @rollup/plugin-json@6.0.0, @rollup/plugin-node-resolve@15.2.1, @rollup/plugin-replace@5.0.2, @rollup/plugin-typescript@11.1.3, @types/resize-observer-browser@0.1.7, path-browserify@1.0.1, rollup-plugin-livereload@2.0.5, rollup-plugin-styles@4.0.0, rollup-plugin-svelte@7.1.6, rollup-plugin-terser@7.0.2, sirv-cli@2.0.2, svelte@3.59.2, util@0.12.5