ENH: add access-control-allow-origin: * headers

handle_server/templates/config.dct

@@ -57,6 +57,12 @@
       "0.NA/0.0"
     )
 
+    "http_config" = {
+      "headers" = {
+        "Access-Control-Allow-Origin" = "*"
+      }
+    }
+
   }
 
 }