Fix broken links.

Author: veleek

docs/frontend/development.mdx

@@ -45,7 +45,7 @@ The easiest way to get started with development is to use Visual Studio Code wit
 
 **Configuring Home Assistant**
 
-1. Follow the [instructions for setting up a Home Assistant devcontainer](https://developers.home-assistant.io/docs/development_environment#developing-with-visual-studio-code--devcontainer)
+1. Follow the [instructions for setting up a Home Assistant devcontainer](/development_environment.mdx#developing-with-visual-studio-code--devcontainer)
 2. Mount the `frontend` directory into the Core devcontainer by adding the following section to `.devcontainer/devcontainer.json` file in the `core` repository.
 
    ```json

docs/supervisor/development.md

@@ -84,7 +84,7 @@ Your local Home Assistant installation will now connect to a remote Home Assista
 
 ## Frontend development
 
-The instructions here is for development of the Supervisor panel, we're going to assume that you have a [Home Assistant frontend development environment](/frontend/development.md) set up with the devcontainer, and that you have [Supervisor API Access](#supervisor-api-access) set up.
+The instructions here is for development of the Supervisor panel, we're going to assume that you have a [Home Assistant frontend development environment](/frontend/development.mdx) set up with the devcontainer, and that you have [Supervisor API Access](#supervisor-api-access) set up.
 
 1. Run the "Develop Supervisor panel" task
 2. Run the task "Run HA Core for Supervisor in devcontainer"