Initial draft with UI changes

@gwprice and @mhoeber , this still needs changes to policy key settings/new images for the Studio changes that will be in tomorrow's release. Also, most of the paragraphs are not wrapped onto new lines, but I didn't want to distract from where I actually made changes. I'll do that later.
The issue is that in the next sprint, two separate types of posts can be made: discussions (often started by asking a question) and questions (that have a concrete answer)
I also didn't want to make a distinction between students and staff here, since the guidance for students says essentially that good discussion posts are stated int he form of a question or titled with a leading question...