There's an issue with the registry that forbids me from pushing into
anything but my personal namespace - might have been introduced by
0697e01144 . For now, I move the hackdoc
image to my personal namespace, as at some point in the future I want to
revamp the registry system, anyway.
We also drive-by fix a mirko.libsonnet typo that, for some reason,
hasn't manifested itself yet.
Change-Id: I8544e4a52610fb84c5c9d8b0de449f785248f60f
