gotour: Replace a hardcoding string with a template mark.
gotour: Replace a hardcoding string with a template mark.

Replace the hardcoding string ``A Tour of Go''
with a template mark ``{{.Title}}''.
It will take a better user experience to the other language.

R=golang-dev
CC=golang-dev
https://codereview.appspot.com/7393044

Committer: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

BenjaminTsai/go-tour-zh-tw,BenjaminTsai/go-tour-zh-tw