More aggressively enable gzip

nginx.conf

@@ -9,3 +9,7 @@ add_header Expect-CT "enforce; max-age=3600";
 add_header Referrer-Policy "no-referrer";
 
 gzip on;
+gzip_vary on;
+gzip_proxied any;
+gzip_comp_level 6;
+gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;