Rename and squish image

Rename image to include version number. Run through pngquant to
decrease the file size by .. a lot really.

doc/operations/incident_management/index.md

@@ -12,10 +12,6 @@ Incident Management enables developers to easily discover and view the alerts
 generated by their application. By surfacing alert information where the code is
 being developed, efficiency and awareness can be increased.
 
-GitLab offers solutions for handling incidents in your applications and services,
-such as [setting up Prometheus alerts](#configure-prometheus-alerts),
-[displaying metrics](./alerts.md#embed-metrics-in-incidents-and-issues), and sending notifications.
-
 ## Configure Prometheus alerts
 
 You can set up Prometheus alerts in: