Add note on notifications for ER13

gracedb/templates/profile/createNotification.html

@@ -6,6 +6,11 @@
 
 {% block content %}
 
+<div style="color: red; padding-top: 20px;, padding-bottom: 5px;">
+<h3>Status of notifications for ER13</h3>
+<p>Notifications are <b>only</b> issued for events at present (December 2018). Notifications for superevents will be added before ER14.</p>
+</div>
+
 <br />
 <div style="padding: 10px;">
 <h3>Instructions</h3>