adds time zone to maintenance announcement

Author: conormcneil

_includes/sbn-header.html

@@ -4,7 +4,7 @@
     <div id="sbn-notices">
 
         <div class="notice">
-            On 2/25/2026 from 9:00 AM to 12:00 PM, archive data access may be unavailable while we perform scheduled maintenance.
+            On 2/25/2026 from 9:00 AM to 12:00 PM (MST), archive data access may be unavailable while we perform scheduled maintenance.
         </div>
 
     </div>