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
I think I might be with David here, this might make more sense in the view, especially as there will be lots of `t` calls there for translating the page furniture. It feels like it would be better to keep them all in one place. Also reckon-y though, it's something we can do later down the line as this stuff takes more shape.