AdHawk - Case Study Cover Image

Revising the case study hero images and this is the one for AdHawk.

The new hero images need to work on both the home page and top of the case study page themselves, as well as the bottom of the case study page - where they're used for navigating between studies. Previously, different images were used for these instances so in re-making them, it's been important to ensure a single image fits a variety of instances.