document k8up slack channel

Signed-off-by: Tobias Brunner <tobias.brunner@vshn.ch>

README.md

@@ -141,7 +141,15 @@ make clean
 There are a number of example configurations in [`config/samples`](config/samples).
 Apply them using `kubectl apply -f config/samples/somesample.yaml`
 
-### Code of Conduct
+# Community
+
+Read more about our community [in the documentation](https://k8up.io/k8up/about/community.html).
+
+## Chat with us
+
+The K8up project is present in the [CNCF Slack Workspace](https://slack.cncf.io/) in the [#k8up channel](https://app.slack.com/client/T08PSQ7BQ/C06GP0D5FEF).
+
+## Code of Conduct
 
 Our code of conduct can be read at [k8up.io](https://k8up.io/k8up/about/code_of_conduct.html).
 

docs/modules/ROOT/pages/about/community.adoc

@@ -3,7 +3,7 @@
 Connect with the K8up community:
 
 https://github.com/k8up-io/k8up/discussions[Discussions]:: The project has GitHub discussions enabled where we discuss everything around K8up. Feel free to hop in there.
-https://community.appuio.ch/[Chat]:: We use the _APPUiO Community Chat_ (registration open) and are reachable in the https://community.appuio.ch/channel/k8up[#k8up] channel.
+https://app.slack.com/client/T08PSQ7BQ/C06GP0D5FEF[Chat]:: We use the https://slack.cncf.io/[CNCF Slack Workspace] and are reachable in the #k8up channel.
 https://github.com/k8up-io/k8up[GitHub]:: The source code and issue tracking is available on _GitHub_ under https://github.com/k8up-io/k8up[k8up-io/k8up].
 
 [discrete]