Updated index of installation page. (#32366)

* Updated index of installation page.

* Update docs/sources/installation/_index.md

accepting suggestions from docs team

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

docs/sources/installation/_index.md

@@ -16,6 +16,7 @@ This section discusses the hardware and software requirements as well as the pro
 - [Install on macOS]({{< relref "mac" >}})
 - [Install on Windows]({{< relref "windows" >}})
 - [Run Docker image]({{< relref "docker" >}})
+- [Deploy Grafana on Kubernetes]({{< relref "kubernetes" >}})
 
 Refer to [Upgrade Grafana]({{< relref "upgrading.md" >}}) topic. If you need to restart Grafana, refer to the [Restart Grafana]({{< relref "Restart-grafana.md" >}})
 topic for detailed information.