Redirect favicon.ico, robots.txt, 500/404/422.html to public

nginx.conf

server {
  listen 80;
  server_name subdomain.domain.com;

  location ~* ^/(favicon.ico|robots.txt|500.html|404.html|422.html)$ {
    root /home/rails/website/current/public;
    try_files $uri =404;
  }

}