move to Vite, away from webpack/vue-cli

[femans]

Using vite, we would get a few annoyances out of the way, foremostly the extremely slow build of webpack. It also has its idiosyncratic box of tricks, such as importing static files, sass&jsx out of the box, and hot-reloading much faster than webpack does.

https://vitejs.dev/

The migration to vite is quite simple, I tried it and it took about 30m. I found an awsome guide here: https://qvault.io/javascript/migrating-vue-webpack-to-vitejs/

But it has a severe downside: it does not deal (easily) deal with vuetify2, I was not able make that happen do it quickly. Therefore it makes sense to implement this while we move to vue3/vuetify3.

Another (react oriented) article: https://blog.slashgear.dev/vite-webpack-killer/

[femans]

closed with #214