Update Previous Ateliers with Atelier IV

[northern-tester]

Problem

We don't want to hang around too long with getting our Previous Ateliers page up to date.

Acc Critera

• Are there some flowery words describing Atelier IV?
• Are there a few pictures in a carousel?
• Is the latest Atelier at the top?
• Have we still got the previous 3 Ateliers?

[northern-tester]

Picked this up for development....

[northern-tester]

Thanks for the code review @sejacksonlee I'll deploy today when I get chance. 👍

[northern-tester]

Deployed to live, closing