Improve navigation between pages

[Aravind SV]

See the new page:

https://docs.gocd.org/current/gocd_on_kubernetes.html

vs. the old page:

https://docs.gocd.org/19.1.0/gocd_on_kubernetes.html

At least, the old page has a link to go to the next page. The new page just drops you into a nearly empty page.