update docker-compose execution

As of Jun 2023, the docker-compose command has been deprecated in favor of the compose plugin.

https://docs.docker.com/compose/install/linux/

docs/setup/README.md

@@ -35,7 +35,7 @@ services:
 Then:
 
 ```bash
-docker-compose up -d
+docker compose up -d
 ```
 
 ## Using MySQL / MariaDB Database