remove Architecture Center from metadata

Reviewed-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-authored-by: tischrei <tino.schreiber@t-systems.com>
Co-committed-by: tischrei <tino.schreiber@t-systems.com>

otc_metadata/data/services/ac.yaml

@@ -1,16 +0,0 @@
----
-environment: hidden
-repositories:
-- environment: internal
-  repo: docs/architecture-center
-  type: gitea
-- environment: public
-  repo: opentelekomcloud-docs/architecture-center
-  type: github
-service_category: other
-service_title: Architecture Center
-service_type: ac
-service_uri: architecture-center
-teams:
-- name: docs-architecture-center-rw
-  permission: write