added update html to remove cache and service worker

nginx.conf

@@ -63,6 +63,15 @@ http {
 
         expires $cache_expires;
 
+        location = /update {
+            return 302 /update.html;
+        }
+
+        location = /update.html {
+            add_header Cache-Control "no-store, no-cache, must-revalidate";
+        }
+
+
         # Redirect old /index.html requests to new file
         location = /index.html {
             return 301 /indexV2.html;