Framework: Layout for /design

[scruffian]

In #2964 we removed the specific layout files for logged out users and the oauth screen. There is still a separate layout screen for /design which we should also remove, although this is more complex due to the server side rendering.

This was suggested by @drewblaisdell in #2964.

Pinging @ehg @mcsf @ockham and @seear who may be interested.

[ockham]

The main reason for LayoutLoggedOutDesign really is server-side rendering. Layout, OTOH, still has a large number of dependencies that won't work on the server-side (they were the actual reason we introduced LayoutLoggedOutDesign in the first place). I don't see any way to get rid of that extra layout any time soon, TBH.

[drewblaisdell]

Yeah, I looked into the changes that would be necessary to run Layout in a browserless environment, and they are legion. Using a separate layout component seems like a reasonable solution to this until we can use these dependencies on the server, so I'm going to close this.