[Website] Add carousel on the Home Page for They tried it out section

Need to add a carousel on the Home Page for They tried it out section.

• Carousel similar to Istio:  https://istio.io/latest/
• Show 3 cards at once, no autorotation
• Users can look at other cards by using the dots below the menu 

Add 2 more logos to carousel: 

Google Cloud Dataflow: 

"Google Cloud Dataflow is a fully managed service for executing Apache Beam pipelines within the Google Cloud Platform ecosystem." 

Scio: 

"Scio is a Scala API for Apache Beam and Google Cloud Dataflow inspired by Apache Spark and Scalding."