Enable gzip on posthog-proxy

Author: kernelwhisperer

graph-node/posthog.conf

@@ -1,5 +1,9 @@
 events {}
 http {
+    gzip on;
+    gzip_disable "msie6";
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
+    
     proxy_ssl_server_name on;
     proxy_ssl_name $proxy_host;