fix broken links

README.md

@@ -33,9 +33,9 @@ Each `RUN` statement creates a Docker image "layer". If one `RUN` statement adds
 
 ### How can I contribute?
 
-If you want to create your own image or add functionality on top of the images available in this repository, then see [How to write Dockerfiles](https://docs.docker.com/develop/develop-images/dockerfile_best-practices/) and the [dev container features reference](https://github.com/devcontainers/spec/blob/main/proposals/devcontainer-features.md). 
+If you want to create your own image or add functionality on top of the images available in this repository, then see [How to write Dockerfiles](https://docs.docker.com/develop/develop-images/dockerfile_best-practices/) and the [dev container features reference](https://containers.dev/implementors/features/). 
 
-This repository contains a select set of images, and we encourage the community to host and share additional images, and features rather than adding them here. You may learn more about this process in [the guidance](https://github.com/devcontainers/spec/blob/main/proposals/devcontainer-features-distribution.md) in our spec repo. You may also check out the [features](https://github.com/devcontainers/features) repo for additional customizations you may adopt or modify for your dev containers.
+This repository contains a select set of images, and we encourage the community to host and share additional images, and features rather than adding them here. You may learn more about this process in [the guidance](https://containers.dev/implementors/features-distribution/) in our spec repo. You may also check out the [features](https://github.com/devcontainers/features) repo for additional customizations you may adopt or modify for your dev containers.
 
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