Lots of refactoring

- Removing test mentions in readme
- moving login page as an app
- removing vite broken config
- removing auto-generated and unused vite configuration (base.css)

Overall simplification

(sorry @Wal I kinda destroyed your login page a bit but seems fixable 👉👈)

frontend/src/main.js

@@ -1,5 +1,6 @@
 import './assets/main.css'
 import 'vue3-toastify/dist/index.css';
+import 'https://kit.fontawesome.com/fb3bbd0a95.js'
 
 import { createApp } from 'vue'
 import App from './App.vue'