update nginx cache control

nginx.conf

@@ -50,7 +50,7 @@ http {
             try_files $uri =404;
             expires 1y;
             access_log off;
-            add_header Cache-Control "public";
+            add_header Cache-Control "public, max-age=60";
         }
 
         # Any route containing a file extension (e.g. /devicesfile.js)