Add screenshot and diagram to Longhorn page based on feedback

content/rancher/v2.x/en/longhorn/_index.md

@@ -6,7 +6,7 @@ weight: 19
 
 [Longhorn](https://longhorn.io/) is a lightweight, reliable and easy-to-use distributed block storage system for Kubernetes.
 
-Longhorn is free, open source software. Originally developed by Rancher Labs, it is now being developed as a sandbox project of the Cloud Native Computing Foundation. It can be installed on any Kubernetes cluster with Helm, with kubectl, or with the Rancher UI.
+Longhorn is free, open source software. Originally developed by Rancher Labs, it is now being developed as a sandbox project of the Cloud Native Computing Foundation. It can be installed on any Kubernetes cluster with Helm, with kubectl, or with the Rancher UI. You can learn more about its architecture [here.](https://longhorn.io/docs/1.0.2/concepts/)
 
 With Longhorn, you can:
 
@@ -19,6 +19,9 @@ With Longhorn, you can:
 - Restore volumes from backup
 - Upgrade Longhorn without disrupting persistent volumes
 
+<figcaption>Longhorn Dashboard</figcaption>
+![Longhorn Dashboard]({{<baseurl>}}/img/rancher/longhorn-screenshot.png)
+
 ### New in Rancher v2.5
 
 Prior to Rancher v2.5, Longhorn could be installed as a Rancher catalog app. In Rancher v2.5, the catalog system was replaced by the **Apps & Marketplace,** and it became possible to install Longhorn as an app from that page.
@@ -59,4 +62,15 @@ The Longhorn project is available [here.](https://github.com/longhorn/longhorn)
 
 ### Documentation
 
-The Longhorn documentation is [here.](https://longhorn.io/docs/)
+The Longhorn documentation is [here.](https://longhorn.io/docs/)
+
+### Architecture
+
+Longhorn creates a dedicated storage controller for each volume and synchronously replicates the volume across multiple replicas stored on multiple nodes.
+
+The storage controller and replicas are themselves orchestrated using Kubernetes.
+
+You can learn more about its architecture [here.](https://longhorn.io/docs/1.0.2/concepts/)
+
+<figcaption>Longhorn Architecture</figcaption>
+![Longhorn Architecture]({{<baseurl>}}/img/rancher/longhorn-architecture.svg)