fix(Docker): improve build and compose files (#255)

* fix(Docker): improve build and compose files

- Adapted `Dockerfile` so the PWD will point to the `/config` folder in the image
- Modified the `docker-compose.yml` to follow the Dockerfile logic
- Added a LABEL to the docker image so it points to the source code

* refactor(Dockerfile): comment WORKDIR /config instruction

* feat(Dockerfile): move back to `/pumpkin` as root folder

docker-compose.yml

@@ -4,5 +4,4 @@ services:
     ports:
       - 25565:25565
     volumes:
-      - ./configuration.toml:/pumpkin/configuration.toml
-      - ./features.toml:/pumpkin/features.toml
+      - ./data:/pumpkin