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 word "discussion" is highly overloaded and I think confusing here. Also, there are ways of removing the discussion in course XML, so the statement that every course includes it is not quite technically true.