The 'Block' group is used for a scheduled blocklist. The group can be
enabled/disabled from a cron job using the provided pihole-toggle-block
script.
e.g.: Enable the 'Block' group in pihole from 8AM until 10PM.
0 8 * * * /home/pi/pihole/pihole-toggle-block
0 22 * * * /home/pi/pihole/pihole-toggle-block