add small message to event analytics page

src/webapp/src/views/admin/events/AnalyticsView.vue

@@ -10,5 +10,7 @@
 <template>
     <div>
         <h2>Event analytics</h2>
+        <p>Get insights into tickets sold, people checked in, available tickets, revenue, etc, in real time!</p>
+        <!-- TODO: Add toggle for real-time update (will fetch every 30s, possibly even using a WS) -->
     </div>
 </template>