Reconnect the "go to registration" buttons to the dashboard.

[hampfh]

Make sure no contract is singable from there but other information is editable.

In ais.armada.nu in the exhibitor tab it is now possible to click "go to registration" which will take the user to the old page before the dashboard. We should replace this with a view that shows the dashboard for that company but without being able to mutate any information (read-only)