Web page: Getting started topic references Istio

[caleno]

Getting started topic on rio.io web page references Istio, which is confusing since the topology on the same page doesn't and to my understanding (which might be wrong) is that Linkerd is the service mesh currently at work (?).

"That’s it! With just a few commands, you'll be up and running with Istio and a simple set of instructions that deliver powerful results for app deployment."

[StrongMonkey]

Hi! The previous version of Rio uses istio while we switched to linkerd later but forgot to update the website. The latest release of Rio use linkerd as service mesh implementation and gloo as API gateway.