Move Dockerfile into docker/...

docker-compose.yml

@@ -4,9 +4,8 @@ services:
   website-dev:
     build:
       context: ./
-      dockerfile: Dockerfile-dev
+      dockerfile: docker/dev/Dockerfile
     volumes:
       - ./src:/var/www/app
     ports:
       - 8080:8080
-

docker/dev/Dockerfile

@@ -21,4 +21,3 @@ CMD ["npm", "run", "serve"]
 
 # allow to be peeked inside
 EXPOSE 8080
-