In some Debian distributives (i.e. Debian 12 standard bookworm image used in GCP) `PermitRootLogin` is already uncommented; the regex in the exercise would skip it. The suggested change will act upon either uncommented line or commented.
The main purpose of this update is to make sure the guide still works with the newest version of all software. In running through the guide I found places to make bug fixes and minor improvements.
cri-containerd project is moving as a sub-project of containerd itself;
the GitHub migration is complete. Also, as of 9 Jan, the beta.1 release
of cri-containerd is available so the download link is updated.
Signed-off-by: Phil Estes <estesp@gmail.com>