Attempt #1 to fix CORS issue and docker build.

docker/nginx.conf

@@ -30,8 +30,6 @@ http {
 
             # CORS headers
             add_header 'Access-Control-Allow-Origin' '*';
-            add_header 'Access-Control-Allow-Methods' 'GET, POST';
-            add_header 'Access-Control-Allow-Headers' 'Content-Type, Accept';
         }
 
         # Error pages