Remove hardcoded dashboard layouts

Got another one for you. It doesn't make sense that only 2 pages are rendered with `layout: false` and the others aren't (so when I click "Make permanent" on the experiment, the page suddenly renders with my application layout.) We could put `layout: false` on all of the render statements, but my proposed solution is just to remove them and let people define the layout in their VanityController, e.g. by putting `layout: false` in there (as I have done.) This is the most flexible solution that's consistent.