upgrade checklist:  ignore errors on a command that rarely works, and disable puppet when disabling the modules timer

Since the project was archived, the group wasn't showing issues...

we skip the `Workflows` section since it doesn't seem well defined yet
and somewhat project specfic. The Structure/Groups section also seemed
redundant with the Content organisation section.

We also skip the exhaustive "Team organisation" list and rely on the
actual `.txt` file for the components mapping instead of inlining it.

We do not trust that this external link will survive forever, and
besides it is better if it lives here, alongside the migration
documentation.

It seems refered to by the .setup file, damnit.

This reverts commit c714a045.