Move stylesheets to public root

This gives us compatibility with redirector and means that the redirector's
smokey tests can run against Bouncer without modification.
Merge pull request #21 from alphagov/move_stylesheets_to_public_root

Move stylesheets to public root
Revert "Move stylesheets to public root"

This reverts commit d7a3459208e21976bd6270cc678e97786f409f5d.