Remove users who no longer work on GOV.UK
Remove users who no longer work on GOV.UK

Anna Shipman, Dan Carley, James Abley, James Stewart and Rob Young no longer
work on GOV.UK. Their access has been removed elsewhere already, so tidy
this up on the mirrors, too.

alphagov/govuk_mirror-puppet,alphagov/govuk_mirror-puppet,alphagov/govuk_mirror-puppet