*example대신에 자신의 도메인 입력
/etc/letsencrypt/live/example.com/privkey.pem
/etc/letsencrypt/live/example.com/cert.pem
server{
listen 80 default_server;
listen [::]:80 default_server;
# SSL configuration
#
listen 443 ssl default_server;
listen [::]:443 ssl default_server;
server_name www.example.com;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
ssl_certificate /etc/letsencrypt/live/example.com/cert.pem;
}