[Toaster] Design - Image recipe details page

[Barros Pena, Belen]

The image customisation feature requires a new page where people can see
all the information available about a certain image recipe. To track the
front end implementation of that page, I've opened

https://bugzilla.yoctoproject.org/show_bug.cgi?id=8070

I don't think any additional back end work is required for this page,
apart from 

https://bugzilla.yoctoproject.org/show_bug.cgi?id=7571

Which is already in progress review.

The design is attached to the Bugzilla entry as usual. Any comments, let
me know.

Thanks,

Belén