Switch from Gitter to Zulip

README.adoc

@@ -7,7 +7,7 @@ image:https://github.com/apache/camel-k/workflows/build/badge.svg["Build", link=
 image:https://goreportcard.com/badge/github.com/apache/camel-k["Go Report Card", link="https://goreportcard.com/report/github.com/apache/camel-k"]
 image:https://godoc.org/github.com/apache/camel-k?status.svg["GoDoc", link="https://godoc.org/github.com/apache/camel-k"]
 image:https://img.shields.io/github/license/openshift/origin.svg?maxAge=2592000["Licensed under Apache License version 2.0", link="https://www.apache.org/licenses/LICENSE-2.0"]
-image:https://badges.gitter.im/apache/camel-k.png["Chat on Gitter", link="https://gitter.im/apache/camel-k"]
+image:https://img.shields.io/badge/zulip-join_chat-brightgreen.svg["Chat on Zulip", link="https://camel.zulipchat.com"]
 
 image:https://github.com/apache/camel-k/workflows/kubernetes/badge.svg["Kubernetes", link="https://github.com/apache/camel-k/actions"]
 image:https://github.com/apache/camel-k/workflows/knative/badge.svg["Knative", link="https://github.com/apache/camel-k/actions"]