Previously these helpers were added by a private deployment script.
There's no reason why they shouldn't be part of godoc proper now
that it's in the go.tools repository.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13722043
Also move some common code from main.go to handlers.go, and
exclude remotesearch.go from the appengine build (it is only
relevant to the command line interface).
R=bradfitz, dsymonds
CC=golang-dev
https://golang.org/cl/12001049