Removed replication dashboard (#17815)

As all replication metrics are moved at bucket level, all replication
graphs as well are added under minio-bucket.json. Removing the independent
replication dashboard.

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

docs/metrics/prometheus/grafana/README.md

@@ -15,10 +15,6 @@ 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 also be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/minio-replication.json).
-
-![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/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)
 
 ![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/grafana-bucket.png)