K8s: add versioning banner (#921)

* add banner to 7.4.6 and 7.8.2 install/upgrade

* changed relrefs to hard links

Author: kaitlynmichael

content/operate/kubernetes/7.4.6/_index.md

@@ -11,6 +11,8 @@ hideListLinks: false
 linkTitle: 7.4.6
 weight: 50
 url: '/operate/kubernetes/7.4.6/'
+bannerText: This documentation applies to version 7.4.6. For documentation on the latest version, see [redis.io/docs/latest/kubernetes/](https://redis.io/docs/latest/kubernetes/).
+bannerChildren: true
 ---
 
 Kubernetes provides enterprise orchestration of containers and has been widely adopted. Redis Enterprise for Kubernetes provides a simple way to get a Redis Enterprise cluster on Kubernetes and enables more complex deployment scenarios.

content/operate/kubernetes/deployment/_index.md

@@ -11,6 +11,8 @@ description: This section lists the different ways to set up and run Redis Enter
 hideListLinks: false
 linkTitle: Deployment
 weight: 11
+bannerText: This page applies to version [7.8.2-6 and above](https://redis.io/docs/latest/operate/kubernetes/release-notes/7-8-2-releases). To install older versions, see the [7.4.6 documentation](https://redis.io/docs/latest/operate/kubernetes/7.4.6/).
+bannerChildren: true
 ---
 
 This section lists the different ways to set up and run Redis Enterprise for Kubernetes. You can deploy on variety of Kubernetes distributions both on-prem and in the cloud via our Redis Enterprise operator for Kubernetes.

content/operate/kubernetes/upgrade/_index.md

@@ -9,6 +9,8 @@ description: Information about upgrading your Redis Enterprise cluster on Kubern
 hideListLinks: true
 linkTitle: Upgrade
 weight: 15
+bannerText: This page applies to version [7.8.2-6 and above](https://redis.io/docs/latest/operate/kubernetes/release-notes/7-8-2-releases). To install older versions, see the [7.4.6 documentation](https://redis.io/docs/latest/operate/kubernetes/7.4.6/).
+bannerChildren: true
 ---
 
 The upgrade process includes updating three components: