Añado nota de letsencrypt

NginxConf202311/IMPORTANTE.md

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+IMPORTANT NOTES:
+ - Congratulations! Your certificate and chain have been saved at:
+   /etc/letsencrypt/live/devfin.reymota.es/fullchain.pem
+   Your key file has been saved at:
+   /etc/letsencrypt/live/devfin.reymota.es/privkey.pem
+   Your cert will expire on 2025-11-08. 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"
+ - 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