README.md: Drop link to OCI scope table

The OCI scope table doesn't exist any more so drop the link. Similar to opencontainers/image-spec#824

Signed-off-by: Qasim Sarfraz <qasimsarfraz@microsoft.com>

README.md

@@ -16,8 +16,6 @@ Additional documentation about how this group operates:
 - [Maintainers' Guide](MAINTAINERS_GUIDE.md)
 - [Releases](RELEASES.md)
 
-The _optional_ and _base_ layers of all OCI projects are tracked in the [OCI Scope Table](https://www.opencontainers.org/about/oci-scope-table).
-
 ## Distributing OCI Images and other content
 
 The OCI Distribution Spec is closely related to the [OCI Image Format Specification] project and the [OCI Runtime Specification] project.