[Glitch] Add notifications for new sign-ups

Port 7b816eb5ae to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/notifications/components/notification.js

@@ -8,6 +8,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import StatusContainer from 'flavours/glitch/containers/status_container';
 import NotificationFollow from './follow';
 import NotificationFollowRequestContainer from '../containers/follow_request_container';
+import NotificationAdminSignup from './admin_signup';
 
 export default class Notification extends ImmutablePureComponent {
 
@@ -63,6 +64,19 @@ export default class Notification extends ImmutablePureComponent {
           unread={this.props.unread}
         />
       );
+    case 'admin.sign_up':
+      return (
+        <NotificationAdminSignup
+          hidden={hidden}
+          id={notification.get('id')}
+          account={notification.get('account')}
+          notification={notification}
+          onMoveDown={onMoveDown}
+          onMoveUp={onMoveUp}
+          onMention={onMention}
+          unread={this.props.unread}
+        />
+      );
     case 'mention':
       return (
         <StatusContainer