♻️(docker) rename frontend-dev service in frontend

The frontend-dev service is in fact using the production image. We
rename it in frontend accordingly with what it really does. We also have
to change name rules in Makefile to be consistent.

docker-compose.yml

@@ -145,7 +145,7 @@ services:
         condition: service_healthy
         restart: true
 
-  frontend-dev:
+  frontend:
     user: "${DOCKER_USER:-1000}"
     build: 
       context: .