Merge pull request #5067 from castrojo/retire-wg-machinelearning

Archive WG Machine Learning's community repo directory and slack

Author: k8s-ci-robot

wg-machine-learning/README.md renamed to archive/wg-machine-learning/README.md

@@ -373,6 +373,7 @@ channels:
   - name: wg-k8s-infra
   - name: wg-lts
   - name: wg-machine-learning
+    archived: true
   - name: wg-multitenancy
   - name: wg-naming
   - name: wg-onprem