Enhance ServicePulse documentation with overview and video (#7909)

* Enhance ServicePulse documentation with overview and video

Added an overview section and a video link for ServicePulse.

* Updating link

* Change YouTube link to new URL

Updated YouTube link for ServicePulse overview video.

* Update YouTube link in Monitoring section

* Update YouTube link in Monitoring section

* Update index.md

Author: afprtclr

servicepulse/index.md

@@ -40,6 +40,10 @@ ServicePulse provides a variety of views to help monitor and manage the health o
 
 ![ServicePulse](images/servicepulse-overview.png 'width=500')
 
+See the video below to get an overview of the views available in ServicePulse.
+
+youtube: https://www.youtube.com/watch?v=OVUqOoPZEW4
+
 ### Dashboard
 
 The dashboard provides a visual overview of the current state of the monitored NServiceBus system. This includes unhealthy endpoints, failed messages and failing custom checks. It also provides information about the latest events in the system, such as detecting a new endpoint or a message processing failure.