usage() {
cat <<EOF
Usage: ${0##*/} [EXTRA_SETTINGS_FILE] DOMAIN
+Note: this is less tested and mature than the apache site script.
+
Setup nginx config with https using
ssl config provided by let's encrypt and my standard
location for storing certs.
EXTRA_SETTINGS_FILE can be - for stdin
-p PORT Proxy to PORT
-h|--help Print help and exit
--- Subsequent arguments are never treated as options
-Note: options and non-options can be in any order.
TODO: add https redir site.
EOF
exit $1