frontend: reorganise assets

src/frontend/js/main.ts

@@ -0,0 +1,12 @@
+import Vue from 'vue/dist/vue.esm.js'
+import i18n from './i18n'
+import App from './app'
+import Login from './login'
+
+Vue.use(i18n)
+
+var vm = new Vue({
+  render: function (h) {
+    return h(window.app.authenticated ? App : Login)
+  }
+}).$mount('#app')