add local links manager to backend box
add local links manager to backend box

Co-Authored-By: Conor Glynn <a82f91007d5ba0577d5436510af817f009f70f5c@users.noreply.github.com>

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