Style case-study page

Add some styling for a case study show page.

- Setup IE specific stylesheets
- Improve the slimmer setup
- Add presenter to interpret content store data
- Use components to build show page
- Add minimal styling for things not covered by the show page
And now I think about, feels a bit weird doing the i18n call in the controller vs view. I'd expect the presenter to know about constructing the key, and the view/`t` to do the actual call in the template. (this is mild reckons)