Enhance the sphinx experience/nagivation with:
* Remove the pointless looking parts of breadcrumb navigtation
* Add a document type switcher to the breadcrumb navigation
* Add a version selection switch to the breadcrumb navigation
(From yocto-docs rev: 1823624bdb9ea002d44c9e6d0fd4cd662bff36ad)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
