[fix] disabled nginx version

proxy/files/nginx.conf

@@ -14,6 +14,9 @@ http {
     uwsgi_temp_path       /tmp/uwsgi_temp;
     scgi_temp_path        /tmp/scgi_temp; 
 
+    # disable server version display
+    server_tokens off;
+    
     client_max_body_size 1m;
     # set larger name bucket for large domain names
     server_names_hash_bucket_size  64;