Remove version selector and edit on Github on search page, as it only se...

...arches the latest docs

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)

closes #4317

These changes will need to be backported to 1.0, 1.1 and 1.2 so that those stop telling the user they are the 'latest'

@jamtur01 @fredlf