Remove Policy Publisher
Remove Policy Publisher

Now that the policy pages are being replaced by topic pages, there
isn't any need for Policy Publisher any more.

These changes will have govuk-puppet remove the app from the machines,
and then once this has been deployed, the govuk-puppet configuration
can be removed.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet