Fix smooth scroll in analytics page
Fix smooth scroll in analytics page

* Smooth scroll in the "Getting started" pages was affecting the smooth scroll in analytics. The
  selector was too broad. Narrowing it to getting-started page only.

GaneshSPatil/www.go.cd,gocd/gocd.github.io,ketan/www.go.cd,gocd/gocd.github.io,ketan/gocd.github.io,ketan/www.go.cd,ketan/gocd.github.io,ketan/gocd.github.io,gocd/www.go.cd,ketan/www.go.cd,gocd/www.go.cd,gocd/www.go.cd,gocd/www.go.cd,gocd/gocd.github.io,GaneshSPatil/www.go.cd,GaneshSPatil/www.go.cd,GaneshSPatil/www.go.cd,gocd/gocd.github.io