Intro: Update "add-on" to "module" (#1933)
Intro: Update "add-on" to "module" (#1933)

* Intro: Update "add-on" to "module"

* Removed Kong for Kubernetes from intro

Removed Kong for Kubernetes from intro according to direction/meeting with Christian and Steven C

* Edited naming conventions
Mashape/getkong.org,Mashape/getkong.org,Mashape/getkong.org