Re-organized grafana dashboards (#19157)

Moved different dashboards to their specific directories. Also
mentioned that these dashbards are examples of how to create
graphs using MinIO provided and metrics and customers should
change / add graphs on their specific need basis.

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

docs/metrics/prometheus/grafana/README.md

@@ -15,10 +15,12 @@ Refer to the dashboard [json file here](https://raw.githubusercontent.com/minio/
 
 ![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/grafana-minio.png)
 
-Replication metrics can be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/minio-replication.json)
+Replication metrics can be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/replication/minio-replication.json)
 
-![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/grafana-replication.png)
+![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/replication/grafana-replication.png)
 
-Bucket metrics can be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/minio-bucket.json)
+Bucket metrics can be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/bubcket/minio-bucket.json)
 
-![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/grafana-bucket.png)
+![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/bucket/grafana-bucket.png)
+
+Note: All these dashboards are provided as an example and need basis they should be customized as well as new graphs should be added.