Migrate frontend to vite

[Kaes3kuch3n]

Replace old build tools (VueCLI + webpack) with vite, since it's the preferred build tool for Vue 3 and it's way faster

[Kaes3kuch3n]

Example migration blogpost: https://vueschool.io/articles/vuejs-tutorials/how-to-migrate-from-vue-cli-to-vite/