SmartHub docs (#3131)
SmartHub docs (#3131)

* adding SmartHub bidder docs

* removed pbjs version note

* using partner Name instead of host due to the changing way building endpoint URL in adapter
discussion in the prebid-server repo: https://github.com/prebid/prebid-server/pull/1932#discussion_r679268047

Co-authored-by: bretg <9df09da23577b88db5b6b8911d0635d4f870e78e@gmail.com>
prebid/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io