Rearrange README a bit

Move image with metrics to the main page

README.md

@@ -150,18 +150,10 @@ Please note that you can add `-name YOUR_NAME_HERE` argument to set custom `name
 label value for metrics exported to Prometheus. This could be useful to separate your
 test metrics from others.
 
-### Grafana Dashboard
-
-Chart examples from [Minigun Grafana dashboard](grafana/Minigun.json):
-![minigun grafana main](docs/images/minigun_main_grafana.png)
-![minigun grafana tcp and dns](docs/images/minigun_tcp_dns_grafana.png)
-
-Please note that this dashboard was designed for a multi-cluster environment in which
-every cluster has a unique `cluster_name` label on every metric, which is implemented
-via Prometheus `global.external_labels` [config option](https://prometheus.io/docs/prometheus/latest/configuration/configuration/).
-
 ## Understanding report
 
+[![minigun metrics](docs/images/minigun-metrics.png)](docs/images/minigun-metrics.svg)
+
 You can read detailed explanation of reported metrics by using CLI help:
 
 ```sh
@@ -170,6 +162,16 @@ minigun -report-help
 
 Or by checking the [following documentation page](./docs/report-help.md)
 
+### Grafana Dashboard
+
+Chart examples from [Minigun Grafana dashboard](grafana/Minigun.json):
+![minigun grafana main](docs/images/minigun_main_grafana.png)
+![minigun grafana tcp and dns](docs/images/minigun_tcp_dns_grafana.png)
+
+Please note that this dashboard was designed for a multi-cluster environment in which
+every cluster has a unique `cluster_name` label on every metric, which is implemented
+via Prometheus `global.external_labels` [config option](https://prometheus.io/docs/prometheus/latest/configuration/configuration/).
+
 ## Local Development
 
 ### Prerequisites