deployment: add topology visualizations (#5858)

Signed-off-by: hagen1778 <roman@victoriametrics.com>

deployment/docker/README.md

@@ -38,6 +38,8 @@ The communication scheme between components is the following:
   and recording rules back to it;
 * [alertmanager](#alertmanager) is configured to receive notifications from `vmalert`.
 
+<img alt="VictoriaMetrics single-server deployment" width="500" src="assets/vm-single-server.png">
+
 To access Grafana use link [http://localhost:3000](http://localhost:3000).
 
 To access [vmui](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#vmui)
@@ -72,6 +74,8 @@ The communication scheme between components is the following:
   and recording rules to `vminsert`;
 * [alertmanager](#alertmanager) is configured to receive notifications from `vmalert`.
 
+<img alt="VictoriaMetrics cluster deployment" width="500" src="assets/vm-cluster.png">
+
 To access Grafana use link [http://localhost:3000](http://localhost:3000).
 
 To access [vmui](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#vmui)