Replace Ember app with Mithril app

js/forum/src/components/welcome-hero.js

@@ -0,0 +1,32 @@
+import Component from 'flarum/component';
+
+export default class WelcomeHero extends Component {
+  constructor(props) {
+    super(props);
+
+    this.title = m.prop('Mithril Forum')
+    this.description = m.prop('Hello')
+    this.hidden = m.prop(localStorage.getItem('welcomeHidden'))
+  }
+
+  hide() {
+    localStorage.setItem('welcomeHidden', 'true')
+    this.hidden(true)
+  }
+
+  view() {
+    var root = m.prop()
+    var self = this;
+    return this.hidden() ? m('') : m('header.hero.welcome-hero', {config: root}, [
+      m('div.container', [
+        m('button.close.btn.btn-icon.btn-link', {onclick: function() {
+          $(root()).slideUp(self.hide.bind(self))
+        }}, m('i.fa.fa-times')),
+        m('div.container-narrow', [
+          m('h2', this.title()),
+          m('p', this.description())
+        ])
+      ])
+    ])
+  }
+}