Update app.js to use the new `createInertiaApp()` factory method

resources/js/app.js

@@ -1,28 +1,24 @@
 import Vue from 'vue'
 import VueMeta from 'vue-meta'
 import PortalVue from 'portal-vue'
-import { App, plugin } from '@inertiajs/inertia-vue'
-import { InertiaProgress } from '@inertiajs/progress/src'
+import { InertiaProgress } from '@inertiajs/progress'
+import { createInertiaApp } from '@inertiajs/inertia-vue'
 
 Vue.config.productionTip = false
 Vue.mixin({ methods: { route: window.route } })
-Vue.use(plugin)
 Vue.use(PortalVue)
 Vue.use(VueMeta)
 
 InertiaProgress.init()
 
-const el = document.getElementById('app')
-
+createInertiaApp({
+  resolve: name => require(`./Pages/${name}`),
+  setup({ el, app, props }) {
     new Vue({
       metaInfo: {
         titleTemplate: title => (title ? `${title} - Ping CRM` : 'Ping CRM'),
       },
-  render: h =>
-    h(App, {
-      props: {
-        initialPage: JSON.parse(el.dataset.page),
-        resolveComponent: name => require(`./Pages/${name}`).default,
-      },
-    }),
+      render: h => h(app, props),
     }).$mount(el)
+  },
+})