Make welcome-hero close into an action

ember/app/controllers/composer.js

@@ -1,19 +0,0 @@
-import Ember from 'ember';
-
-export default Ember.Controller.extend({
-
-    needs: ['index'],
-
-    user: Ember.Object.create({avatarNumber: 1}),
-
-    showing: false,
-
-    title: 'Replying to <em>Some Discussion Title</em>',
-
-    actions: {
-        close: function() {
-            this.set('showing', false);
-        }
-    }
-
-});