US-1 Overview of exhibitions

User story

As a visitor I want to be able to see an overview of all the available exhibitions so that I know choose which one I want to check out.

Prerequisites

•  Visitor view exists

Acceptance criteria

• The overview page exists.
• When an exhibition has been published, a link to it appears on the page.

Sprint Ready Checklist

1. Acceptance criteria defined
2. Team understands acceptance criteria
3. Team has defined solution / steps to satisfy acceptance criteria
4. Acceptance criteria is verifiable / testable
5. External / 3rd Party dependencies identified