Bump nginx limits (#278)

frontend/nginx/nginx.conf

@@ -1,11 +1,12 @@
 user  nginx;
-worker_processes  1;
+worker_processes  auto;
+worker_rlimit_nofile  30000;
 
 error_log  /var/log/nginx/error.log warn;
 pid        /var/run/nginx.pid;
 
 events {
-    worker_connections  1024;
+    worker_connections  8000;
 }
 
 http {