sig-cl: remove nested CAPI provider subproject

sigs.yaml

@@ -1206,22 +1206,6 @@ sigs:
       frequency: weekly starting Tuesday December 7th, 2021
       url: https://zoom.us/j/94685513559?pwd=cnI3RUQyZ3RrckpOc1BQNDA1Q1BrZz09
       archive_url: https://docs.google.com/document/d/1ZAnRLCKOVbDqrsrYis2OR0aZIAlqp576gCJVCkMNiHM/edit?usp=sharing
-  - name: cluster-api-provider-nested
-    description: Cluster API infrastructure provider for Nested Clusters
-    contact:
-      slack: cluster-api-nested
-      mailing_list: https://groups.google.com/forum/#!forum/kubernetes-sig-cluster-lifecycle
-    owners:
-    - https://raw.githubusercontent.com/kubernetes-sigs/cluster-api-provider-nested/master/OWNERS
-    meetings:
-    - description: Cluster API Provider Nested Office Hours
-      day: Tuesday
-      time: "10:00"
-      tz: PT (Pacific Time)
-      frequency: weekly
-      url: https://zoom.us/j/91929881559?pwd=WllxazhTUzBFN1BNWTRadTA3NGtQQT09
-      archive_url: https://docs.google.com/document/d/10aTeq2lhXW_3aFQAd_MdGjY8PtZPslKhZCCcXxFp3_Q/edit
-      recordings_url: https://www.youtube.com/playlist?list=PL69nYSiGNLP29D0nYgAGWt1ZFqS9Z7lw4
   - name: cluster-api-provider-openstack
     description: Cluster API infrastructure provider for OpenStack
     contact: