Create compatability.mdx for Consul Kubernetes docs (#8655)

Create Compatibility Matrix page for Consul and Consul on Kubernetes underneath Upgrade section in the Kubernetes docs.

website/data/docs-navigation.js

@@ -155,7 +155,10 @@ export default [
       },
       'service-sync',
       'dns',
-      'upgrade',
+      {
+        category: 'upgrade',
+        content: ['compatibility'],
+      },
       'uninstall',
       'helm',
     ],

website/pages/docs/k8s/upgrade/compatibility.mdx

@@ -0,0 +1,20 @@
+---
+layout: docs
+page_title: Compatibility Matrix
+sidebar_title: Compatibility Matrix
+description: Compatibility Matrix for Consul Kubernetes and Consul
+---
+
+# Compatibility Matrix for Consul Kubernetes and Consul 
+
+Consul Kubernetes (consul-k8s) is managed using Consul Helm. For every release of Consul Kubernetes, a new version of the Consul Kubernetes 
+Helm chart and Consul Kubernetes binary is released through the HashiCorp Helm repository. The recommended best practice is to upgrade
+the Helm chart which will ensure a compatible version of the Consul Kubernetes binary is used.
+
+## Supported Versions
+
+| Consul Version      | Compatible Consul Helm Versions  |
+| ------------------- | -------------------------------- |
+| 1.8.x               | 0.22.0 - 0.24.1                  |
+| 1.7.x               | 0.17.0 - 0.21.0                  |
+| 1.6.x               | 0.10.0 - 0.16.2                  |