Define and document how to rollback

[jernst]

Define and then document how to rollback an entire system. This probably requires the manual copying of /boot/* to some safe place on the btrfs filesystem before changes, and manual restore during rollback.

[jernst]

If I just do:

• snapper rollback
• and if I kept a copy of /boot/* and restored its content to the previous version, so we will run the same kernel version again

then:

• root will be mounted from subvol .snapshots/XXX/snapshot (not ideal)
• /var/log will be empty.