Allow customizing Nginx worker_connections

[tangrufus]

If you need more connections than this[8000], you start optimizing your OS. That's probably the point at which you hire people who are smarter than you as this is a lot of requests.
Should be < worker_rlimit_nofile.

https://github.com/h5bp/server-configs-nginx/blob/c5c6602232e0976d9e69d69874aa84d2a2698265/nginx.conf#L19-L25

Nginx Default worker_connections: 512
Trellis / h5bp Default worker_connections: 8000
Trellis / h5bp Default worker_rlimit_nofile: 8192

[swalkinshaw]

Thanks 👍