feat(aio): add v6 release notification (#23690)

PR Close #23690

aio/src/app/app.component.html

@@ -8,13 +8,13 @@
   <mat-toolbar-row class="notification-container">
     <aio-notification
       icon="insert_comment"
-      iconLabel="Survey"
-      buttonText="Go to survey"
-      actionUrl="https://bit.ly/angular-survey-2018"
-      notificationId="survey-january-2018"
-      expirationDate="2018-01-19"
+      iconLabel="Announcement"
+      buttonText="Learn More"
+      actionUrl="https://blog.angular.io/version-6-0-0-of-angular-now-available-cc56b0efa7a4"
+      notificationId="angular-v6-announcement"
+      expirationDate="2018-07-01"
       (dismissed)="notificationDismissed()">
-      Help Angular by taking a <b>1 minute survey</b>!
+      Version 6 of Angular Now Available!
     </aio-notification>
   </mat-toolbar-row>
   <mat-toolbar-row>