move up root password setting and show more prominently

We need to copy this into the password manager so it *needs* to be
obvious here.

tsa/howto/new-machine-hetzner-robot.mdwn

@@ -107,9 +107,10 @@ which we'll use below.
     opposed to the *partition* which is `$BOOT_DEVICE`.
 
         BOOT_DISK=/dev/nvme0n1 &&
+        ROOTPASSWORD=$(tr -dc 'A-Za-z0-9' < /dev/urandom | head -c 30) &&
+        echo "root password: $ROOTPASSWORD" &&
         mkdir -p /target/run && mount -t tmpfs tgt-run /target/run &&
         mkdir /target/run/udev && mount -o bind /run/udev /target/run/udev &&
-        ROOTPASSWORD=$(tr -dc 'A-Za-z0-9' < /dev/urandom | head -c 30) &&
         apt-get install -y grml-debootstrap && \
         sed -e 's/postfix//;
                 s/vlan//;