Move client and server dockerfile to special path

docker-compose.yml

@@ -20,7 +20,7 @@ services:
   server:
     build:
       context: .
-      dockerfile: Dockerfile.server
+      dockerfile: docker/Dockerfile.server
     environment:
       HOST: db
       PORT: 3306
@@ -42,7 +42,7 @@ services:
   client:
     build:
       context: .
-      dockerfile: Dockerfile.client
+      dockerfile: docker/Dockerfile.client
     depends_on:
       server:
         condition: service_healthy