increase buffer size for apps with large headers to load

docker/nginx/conf.d/include/proxy-buffer

@@ -1,4 +1,5 @@
 # if you are expecting large headers (ie. Skynet-Skyfile-Metadata), tune these values to your needs
-proxy_buffer_size 128k;
-proxy_buffers 4 256k;
-proxy_busy_buffers_size 256k;
+# read more: https://www.getpagespeed.com/server-setup/nginx/tuning-proxy_buffer_size-in-nginx
+proxy_buffer_size 4096k;
+proxy_buffers 64 256k;
+proxy_busy_buffers_size 4096k; # at least as high as proxy_buffer_size