[WebTunnel] Create daily cron job to check and renew the certs if needed
The main documentation is missing how to renew the domain certificate: https://community.torproject.org/relay/setup/webtunnel/
As we're using acme.sh script, we could add the instructions:
- cronjob: https://github.com/acmesh-official/acme.sh?tab=readme-ov-file#2-or-install-from-git
- manual renew: https://github.com/acmesh-official/acme.sh?tab=readme-ov-file#12-how-to-renew-the-certs
Operator feedback: https://forum.torproject.org/t/is-there-a-guide-on-how-to-renew-the-certificate-for-webtunnel-with-minimal-downtime/12445