Updated SSL certificate renewal instructions (systemd / certbot.timer)

tutorials/creating_ssl_certificates.md

@@ -53,16 +53,17 @@ certbot -d example.com --manual --preferred-challenges dns certonly
 
 ### Auto Renewal
 
-You'll also probably want to configure the automatic renewal of certificates to prevent unexpected certificate expirations.
-You can open crontab with `sudo crontab -e` and add the line from below to the bottom of it for attempting renewal every day at 23 (11 PM).
+Certbot installs a systemd timer (certbot.timer) by default.
+Verify it is enabled:
 
-Deploy hook would restart the Nginx service to apply a new certificate when it's renewed successfully. Change `nginx` in the restart command to suit your own needs, such as to `apache` or `wings`.
+```bash
+systemctl status certbot.timer
+```
 
-For advanced users, we suggest installing and using [acme.sh](https://acme.sh)
-which provides more options, and is much more powerful than certbot.
+If it is not enabled:
 
-``` text
-0 23 * * * certbot renew --quiet --deploy-hook "systemctl restart nginx"
+```bash
+systemctl enable --now certbot.timer
 ```
 
 ### Troubleshooting