Initial Debian bookworm Root on ZFS page (#444)

* First update for Bookworm. Copeied Bullseye to Bookworm. s/Bookworm/Bullseye and added the 'Newer Release' to Bullseye.

* not all changes made it last time

* Most changes except timedatectl and mtab.  want to verify with gnome iso install disk

* mtab is already included in the chroot env

* verification of timedatectl does not work in chroot env due to lack
of systemd

* there was no option to select disks when installing grub-pc for a bios install