feat: add Dev Container Features by ProxayFox to collection index (#623)

Author: ProxayFox

_data/collection-index.yml

@@ -1280,6 +1280,11 @@
   contact: https://github.com/pairspaces/devcontainers/issues
   repository: https://github.com/pairspaces/devcontainers
   ociReference: ghcr.io/pairspaces/devcontainers/pairspaces
+- name: Dev Container Features by ProxayFox
+  maintainer: ProxayFox
+  contact: https://github.com/ProxayFox/devcontainer-features/issues
+  repository: https://github.com/ProxayFox/devcontainer-features
+  ociReference: ghcr.io/proxayfox/devcontainer-features
 - name: Databricks CLI Feature
   maintainer: KingBain
   contact: https://github.com/KingBain/devcontainer-features-databricks/issues