Rename guide to match template links

Author: Chuxel

_posts/2022-12-16-dockerfiles.md renamed to _posts/2022-12-16-dockerfile.md

@@ -5,7 +5,7 @@ author: "@chuxel"
 authorUrl: https://github.com/chuxel
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-When creating a development container, you have a variety of different ways to customize your environment like ["Features"](/features) or [lifecycle scripts](/implementors/json_reference/#lifecycle-scripts). However, if you are familiar with containers, you may want to use a [Dockerfile](/guide/dockerfiles#dockerfile) or [Docker Compose / Compose](/guide/dockerfiles#docker-compose) to customize your environment. This article will walk through how to use these formats with the Dev Container spec.
+When creating a development container, you have a variety of different ways to customize your environment like ["Features"](/features) or [lifecycle scripts](/implementors/json_reference/#lifecycle-scripts). However, if you are familiar with containers, you may want to use a [Dockerfile](/guide/dockerfile#dockerfile) or [Docker Compose / Compose](/guide/dockerfile#docker-compose) to customize your environment. This article will walk through how to use these formats with the Dev Container spec.
 
 ## <a href="dockerfile" name="dockerfile" class="anchor">  Using a Dockerfile </a>