Mainly small install script improvements - Consistent usage of `$LUANHOME`, removed reliance on current directory. - Made Luan build and install fine (on Linux) without requiring launching it via sudo. Only asks to elevate privileges if installation failed. - Minor spelling mistake fix.

#!/bin/bash

set -e

cd "$1";

ROOTPWD=$(pwd);

./acme.sh --renew-all --cert-home "$ROOTPWD"/sites --config-home "$ROOTPWD"/local/letsencrypt/config;

sudo $(which nginx) -s reload;