This reverts commit 3d78aecc47.
Turns out that there's a time limit on builds, and sphinx output has a
whole lot of JS that gets bundled and minified.
We end up running up against the time limit and the whole build fails.
Therefore, revert it.
I'm not sure if this will actually work, but if it does, it'll reduce
the size of a bunch of the image files automatically & not require us to
worry about that anymore.
It'll also combine all our JS & CSS files into a single bundled request.
