Remove https://github.com/favalos/devcontainer-features from list of features (#637)

Deletes the source repository because it's not maintained and there are other equivalent features

Author: kewne

_data/collection-index.yml

@@ -383,11 +383,6 @@
   contact: https://github.com/CodeMan99/features/issues
   repository: https://github.com/CodeMan99/features
   ociReference: ghcr.io/codeman99/features
-- name: Features by Favalos
-  maintainer: Fernando Avalos
-  contact: https://github.com/favalos/devcontainer-features/issues
-  repository: https://github.com/favalos/devcontainer-features
-  ociReference: ghcr.io/favalos/devcontainer-features
 - name: Community Templates
   maintainer: devcontainers-community
   contact: https://github.com/orgs/devcontainers-community/discussions