feat(role): Secure SSH config

ansible/roles/20-common-20-ssh/files/etc/ssh/sshd_config

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+PubkeyAuthentication yes
+PasswordAuthentication no
+PermitEmptyPasswords no
+UsePAM no
+PermitRootLogin without-password
+PrintMotd yes

ansible/roles/20-common-20-ssh/files/root/.ssh/authorized_keys.example

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+ssh-ed25519 AAAAC3NzaC1lZ... comment

ansible/roles/20-common-20-ssh/files/root/.ssh/known_hosts.example

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+host.name ssh-rsa AAAAB3NzaC1...