admin broadcast message feature

capsulflask/templates/admin.html

@@ -152,6 +152,19 @@
   <hr/>
 {% endif %}
 
+<div class="third-margin">
+  <div class="row">
+    <h1>📰 Sitewide Banner: Post a temporary message across the site 📰</h1>
+  </div>
+  <div class="row">
+    <form method="post" class="megaphone">
+      <input type="hidden" name="action" value="set_broadcast_message"></input> 
+      <input type="hidden" name="csrf-token" value="{{ csrf_token }}"/>
+      <input type="text"  name="message"  placeholder="blahblahblah..." />
+      <input type="submit" value="SET"/>
+    </form>
+  </div>
+
 <div class="third-margin">
   <div class="row">
     <h1>📢 Admin Megaphone: Email All Users who have Active Capsuls 📢</h1>