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.
Since "anonymous to peers" is more useful functionality to course teams than "anonymous to all", Lou thinks that we should hold off on documenting either one until anonymous to peers works correctly.