1. we use the "rescue" dialog instead of mounting/unmounting an
    ISO (simpler, and two less steps)
 2. teach operator about the german keyboard a bit
 3. get rid of the KEYRING hack (see tsa-misc for details)
 4. run in a screen (in case we lose network)
 5. show how to deploy tsa-misc (trusting HTTPS here)

Procedure is still too complicated but at least has one less step (11
instead of 12).