Revert "website: latest migration to new structure" (#11634)

Revert "website: latest migration to new structure (#11522)"

This reverts commit 9a89a5f94b.

website/docs/developer-docs/setup/frontend-dev-environment.md

@@ -1,52 +0,0 @@
----
-title: Frontend-only development environment
----
-
-If you want to only make changes on the UI, you don't need a backend running from source. You can user the docker-compose install with a few customizations.
-
-### Prerequisites
-
--   Node.js (any recent version should work; we use 20.x to build)
--   Make (again, any recent version should work)
--   Docker and Docker Compose
-
-:::info
-Depending on platform, some native dependencies might be required. On macOS, run `brew install node@20`, and for Docker `brew install --cask docker`
-:::
-
-### Instructions
-
-1. Clone the git repo from https://github.com/goauthentik/authentik.
-2. In the cloned repository, follow the docker-compose installation instructions [here](../../install-config/install/docker-compose).
-3. Add the following entry to your `.env` file:
-
-    ```
-    AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
-    AUTHENTIK_TAG=gh-next
-    AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-next
-    AUTHENTIK_LOG_LEVEL=debug
-    ```
-
-    This will cause authentik to use the beta images.
-
-4. Add this volume mapping to your compose file.
-
-    ```yaml
-    services:
-        # [...]
-        server:
-            # [...]
-            volumes:
-                - ./web:/web
-                - ./local.env.yml:/local.env.yml
-    ```
-
-    This makes the local web files and the config file available to the authentik server.
-
-5. Run `docker compose up -d` to apply those changes to your containers.
-6. `cd web`
-7. Run `npm i` and then `npm run watch` to start the build process.
-
-You can now access authentik on http://localhost:9000 (or https://localhost:9443).
-
-You might also want to complete the initial setup under `/if/flow/initial-setup/`.