Document Atlas NAS backups and monitoring

ansible/roles/profile_atlas/templates/atlas-health-monitor.service.j2

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+[Unit]
+Description=Check Atlas pool, disks, capacity, temperatures and maintenance jobs
+Wants=houston-dbus.service network-online.target
+After=zfs.target houston-dbus.service network-online.target
+ConditionFileIsExecutable=/usr/local/libexec/atlas-health-monitor
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/libexec/atlas-health-monitor
+User=root
+Group=root
+UMask=0077
+StateDirectory=atlas-health-monitor
+StateDirectoryMode=0700
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectHome=true
+ProtectSystem=strict
+ReadWritePaths=/var/lib/atlas-health-monitor
+ProtectKernelTunables=true
+ProtectKernelModules=true
+ProtectControlGroups=true
+RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
+RestrictRealtime=true
+LockPersonality=true