After certbot installed and renew

cf: https://pimylifeup.com/raspberry-pi-ssl-lets-encrypt/

Some settings about firewall:

1. sudo vim /etc/arno-iptables-firewall/conf.d/00debconf.conf,
   add 443 for OPEN_TCP and OPEN_UDP
2. Add 443 port forward in wifi web page
3. Two more things:
   sudo a2enmod ssl
   sudo a2ensite default-ssl
4. If it can be connected but shows secure error try this again:
   sudo certbot --apache

 IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/kpchiao9600k.sino.tw/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/kpchiao9600k.sino.tw/privkey.pem
   Your cert will expire on 2023-05-29. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot again
   with the "certonly" option. To non-interactively renew *all* of
   your certificates, run "certbot renew"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

Run this to update certificaion:

sudo certbot certonly --standalone -d example.com -d www.example.com