Add ambassador survey results summary chart

[caniszczyk]

https://github.com/cncf/surveys/tree/main/ambassador/

It would be great if we had a similar summary chart for ambassadors like we do with maintainers.

[idvoretskyi]

Sounds good, will work on this week!

[krook]

Followed up with @idvoretskyi and @k8tgreenley to see how we can get data from newer Ambassador surveys in here.