Update serverconfig.json

arcgis.com allows CORS request from all origins and can be removed from proxy list.

Author: na9da

serverconfig.json

@@ -5,7 +5,6 @@
     "nicta.com.au",
     "gov.au",
     "csiro.au",
-    "arcgis.com",
     "argo.jcommops.org",
     "www.abc.net.au",
     "geoserver.aurin.org.au",