chore: move dev env files to dev subfolder

docker/config.dev.yml

@@ -1,54 +0,0 @@
-general:
-  public_url: http://localhost:8080
-  api_key: some_secret_api_key
-  secret_key: some_secret_key
-
-database:
-  host: postgres
-
-rabbitmq:
-  host: rabbitmq
-
-playout:
-  liquidsoap_host: liquidsoap
-
-liquidsoap:
-  server_listen_address: 0.0.0.0
-
-stream:
-  outputs:
-    .default_icecast_output: &default_icecast_output
-      host: icecast
-      port: 8000
-      source_password: hackme
-      admin_password: hackme
-      name: LibreTime!
-      description: LibreTime Radio!
-      website: https://libretime.org
-      genre: various
-
-    icecast:
-      - <<: *default_icecast_output
-        enabled: true
-        mount: main.ogg
-        audio:
-          format: ogg
-          bitrate: 256
-
-      - <<: *default_icecast_output
-        enabled: true
-        mount: main.opus
-        audio:
-          format: opus
-          bitrate: 256
-
-      - <<: *default_icecast_output
-        enabled: true
-        mount: main.mp3
-        audio:
-          format: mp3
-          bitrate: 256
-
-    system:
-      - enabled: false
-        kind: pulseaudio