feat: deploy the sveltekit project on GitHub Pages

Switch from `@sveltejs/adapter-auto` to `@sveltejs/adapter-static` (use v2 because v3 is for sveltekit v2) to be able to create a SPA.
Downgrade `vite` to v4 because `@sveltejs/adapter-static` doesn't support vite v5

In addition, bump svelte dependencies
  - svelte from 4.2.8 to 4.2.18
  - svelte-check to 3.8.5
  - @sveltejs/kit from 1.28.0 to 1.30.4 (migration to v2 will be done later)