2024-10-02 Control the ssh login messages

I found that the settings in `/etc/ssh/sshd_config` had no effect. Namely, `PrintLastLog no` and `PrintMotd no`.

Instead, what helped was to edit `/etc/pam.d/sshd` and comment the first line (to get rid of the `uname -a` stuff identifying the system). I kept the second line because `/etc/motd` just says "This is the server."

# session    optional     pam_motd.so  motd=/run/motd.dynamic                                                          
session    optional     pam_motd.so noupdate

I got rid of the `fish` greeting by using `set -U fish_greeting ""` – although using `set -U fish_greeting "🐟"` would be a cute alternative. 😄

#Administration