feat: clean up /etc/skel and move ssh key to /etc/ssh/authorized_keys/

quests/.includes/sshd_config

@@ -37,7 +37,7 @@ Include /etc/ssh/sshd_config.d/*.conf
 PubkeyAuthentication yes
 
 # Expect .ssh/authorized_keys2 to be disregarded by default in future.
-#AuthorizedKeysFile     .ssh/authorized_keys .ssh/authorized_keys2
+AuthorizedKeysFile     /etc/ssh/authorized_keys/%u
 
 #AuthorizedPrincipalsFile none