kiali twitter header image

from Alissa:

that's how it looks now, just a screenshot from the graph
https://twitter.com/kialiproject

Here some twitter accounts with examples someone from the team sent me:
https://twitter.com/prometheusio?lang=en
https://twitter.com/docker?lang=en
https://twitter.com/reactnative
https://twitter.com/openshift
https://twitter.com/MySQL
https://twitter.com/Square
https://twitter.com/camaloon

nothing fancy or time consuming is needed, just something more aesthetic than the current one.
Maybe a background with the relevant color palette and our logo and a couple of words like "observability of Istio service mesh" or one of the images from the features section on front page adjusted to the right dimensions?