Restructure things to be a little more helpful. Also add a reference to
the Dockerfile we provide and remove an errant header that should have
been removed in change Ife108e6ae191641b56e872e4616a3f4ec78281e8.

Change-Id: I5f562a99ccee7db485b5d40ef4ea6f2e2e362c13
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>