Fix link to in-depth guide on prebuilds article (devcontainers#626)

Author: jasonmfehr

_implementors/reference.md

@@ -110,7 +110,7 @@ We recommend using the [Dev Container CLI](#npm-install) (or other spec supporti
 devcontainer build --workspace-folder . --push true --image-name <my_image_name>:<optional_image_version>
 ```
 
-You can also check out our [in-depth guide on prebuilds](/_posts/2023-08-22-prebuild.md).
+You can also check out our [in-depth guide on prebuilds](/guide/prebuild).
 
 #### <a href="#labels" name="labels" class="anchor"> Metadata in image labels</a> 
 
@@ -143,4 +143,5 @@ See the [Dev Container metadata reference](../json_reference) for information on
 If you are behind a firewall that needs to allow specific domains used by the Dev Container CLI, here's the list of hostnames you should allow communication to go through:
 
 * `containers.dev` - The [homepage](https://containers.dev/) for everything about dev containers. It includes all official and community-supported [Features](https://containers.dev/features) and [Templates](https://containers.dev/templates).
-* `ghcr.io`, `*.azurecr.io`, `mcr.microsoft.com` - [OCI registries](https://containers.dev/implementors/features-distribution/#oci-registry) like [GitHub Container Registry](https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry), [Azure Container Registry](https://azure.microsoft.com/en-us/products/container-registry), and [Microsoft Container Registry](https://mcr.microsoft.com/en-us/catalog?search=dev%20container) serves as the primary distribution mechanism for dev container resources. 
+
+* `ghcr.io`, `*.azurecr.io`, `mcr.microsoft.com` - [OCI registries](https://containers.dev/implementors/features-distribution/#oci-registry) like [GitHub Container Registry](https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry), [Azure Container Registry](https://azure.microsoft.com/en-us/products/container-registry), and [Microsoft Container Registry](https://mcr.microsoft.com/en-us/catalog?search=dev%20container) serves as the primary distribution mechanism for dev container resources.