Update Slack Invitation (kubeflow#2349)

Signed-off-by: Andrey Velichkevich <andrey.velichkevich@gmail.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -5,5 +5,8 @@ contact_links:
     url: https://www.kubeflow.org/docs/components/katib/
     about: Much help can be found in the docs
   - name: Kubeflow Katib Slack Channel
-    url: https://cloud-native.slack.com/archives/C073N7AS48P
-    about: Ask the Katib community on Slack
+    url: https://www.kubeflow.org/docs/about/community/#kubeflow-slack-channels
+    about: Ask the Katib community on CNCF Slack
+  - name: Kubeflow Katib Community Meeting
+    url: https://bit.ly/2PWVCkV
+    about: Join the Kubeflow AutoML working group meeting

README.md

@@ -7,7 +7,7 @@
 [![Coverage Status](https://coveralls.io/repos/github/kubeflow/katib/badge.svg?branch=master)](https://coveralls.io/github/kubeflow/katib?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/kubeflow/katib)](https://goreportcard.com/report/github.com/kubeflow/katib)
 [![Releases](https://img.shields.io/github/release-pre/kubeflow/katib.svg?sort=semver)](https://github.com/kubeflow/katib/releases)
-[![Slack Status](https://img.shields.io/badge/slack-join_chat-white.svg?logo=slack&style=social)](https://kubeflow.slack.com/archives/C018PMV53NW)
+[![Slack Status](https://img.shields.io/badge/slack-join_chat-white.svg?logo=slack&style=social)](https://www.kubeflow.org/docs/about/community/#kubeflow-slack-channels)
 
 Katib is a Kubernetes-native project for automated machine learning (AutoML).
 Katib supports