[rudyrigot]

We call it the "activity". It exists in two different fashions: you can view the one of the whole repository, or just focus on the one of a given document.

For your front-end, you can use absolutely everything you want! Open-source template, or anything; I usually use Bootstrap3, because I'm a huge fan myself. :)

And to answer your last question: we're not using Yahoo's PureCSS in the writing-room.