remove wg-api-expression from sigs.yaml

TODO: presubmit probably should've caught this when archiving the WG README etc.?

Author: BenTheElder

sigs.yaml

@@ -3215,41 +3215,6 @@ sigs:
     - https://raw.githubusercontent.com/kubernetes-sigs/sig-windows-dev-tools/master/OWNERS
     - https://raw.githubusercontent.com/kubernetes-sigs/sig-windows-tools/master/OWNERS
 workinggroups:
-- dir: wg-api-expression
-  name: API Expression
-  mission_statement: >
-    Enable API authors to better serve API consumers, by improving and documenting
-    all aspects of Kubernetes API development.
-
-    [See full Mission Statement](https://docs.google.com/document/d/1XYbQXfge2qKM9psksfC5XZnW8hybtLqL1EcJLU4JwKg).
-
-  stakeholder_sigs:
-  - API Machinery
-  - Architecture
-  label: api-expression
-  leadership:
-    chairs:
-    - github: apelisse
-      name: Antoine Pelisse
-      company: Google
-    - github: kwiesmueller
-      name: Kevin Wiesmueller
-      company: Google
-  meetings:
-  - description: Regular WG Meeting
-    day: Tuesday
-    time: "9:30"
-    tz: PT (Pacific Time)
-    frequency: biweekly
-    url: https://zoom.us/j/94238112084
-    archive_url: https://docs.google.com/document/d/1CSpNaicbEqKJoW306qaQEBIkwC1mGIcKl3yiB_C0HZk
-    recordings_url: https://www.youtube.com/playlist?list=PL69nYSiGNLP0CU9g6-yb1NgZXGAhMxfFE&jct=9Leh8O_yrRTB0Kcv3rMKZHncZq8POg
-  contact:
-    slack: wg-api-expression
-    mailing_list: https://groups.google.com/forum/#!forum/kubernetes-wg-api-expression
-    liaison:
-      github: BenTheElder
-      name: Benjamin Elder
 - dir: wg-batch
   name: Batch
   mission_statement: >