Migrate to SvelteKit 4 | Update Build (#44)

[git-pi-e]

• Migrate to SvelteKit-4

• Update dependencies:

  • Replace node-sass with sass
  • vite is used instead of svelte-kit now

• Update build scripts:

  • Migrate completely to pnpm

• Add develop branch to test in PRs

• Refactor(footer): Remove link to Galileo Since Galileo is supposed to be a route, build it separately

BREAKING CHANGE: Build & deploy process