Get admin area working again

js/admin/src/components/DashboardPage.js

@@ -0,0 +1,16 @@
+import Component from 'flarum/Component';
+
+export default class DashboardPage extends Component {
+  view() {
+    return (
+      <div className="DashboardPage">
+        <div className="container">
+          <h2>Welcome to Flarum Beta</h2>
+          <p>This is beta software; you shouldn't use it in production.</p>
+          <p>You're running version X</p>
+          <p>Get help on X. Report bugs here. Feedback here. Contribute here.</p>
+        </div>
+      </div>
+    );
+  }
+}