Update collection-index.yml (devcontainers#452)

Author: bamurtaugh

_data/collection-index.yml

@@ -38,16 +38,6 @@
   contact: https://github.com/mpriscella/features/issues
   repository: https://github.com/mpriscella/features
   ociReference: ghcr.io/mpriscella/features
-- name: DevContainers-Contrib Features
-  maintainer: Daniel Braun
-  contact: https://github.com/devcontainers-contrib/features/issues
-  repository: https://github.com/devcontainers-contrib/features
-  ociReference: ghcr.io/devcontainers-contrib/features
-- name: DevContainers-Contrib Templates
-  maintainer: Daniel Braun
-  contact: https://github.com/devcontainers-contrib/templates/issues
-  repository: https://github.com/devcontainers-contrib/templates
-  ociReference: ghcr.io/devcontainers-contrib/templates
 - name: Assorted Features
   maintainer: eitsupi
   contact: https://github.com/eitsupi/devcontainer-features/issues