Ensure breadcrumbs are added to high-volume transaction dashboards.

Once we have designs for department/agency dashboard pages, we should
revisit the way all this config is handled, because it's quite messy
at the moment.
Display footers on high volume dashboards
Merge pull request #426 from alphagov/bugfix/breadcrumbs-on-high-volume-transactions

Ensure breadcrumbs are added to high-volume transaction dashboards.
Merge pull request #427 from alphagov/add-footers-to-high-volume-dashboards

Display footers on high volume dashboards