A bit more documentation for migration towards new setup

Following discussion with @mlbonhomme yesterday

Makefile

@@ -51,10 +51,17 @@ release:
 	git tag $(version)
 	git push origin master $(version)
 
-stack: docker/ssl/ark-cert.pem
+clean-docker:
+	$(eval containers:=$(shell docker ps -a -q))
+	@if [ -n "$(containers)" ]; then \
+		echo "Cleaning up past containers\n" \
+		docker rm -f $(containers) ; \
+	fi
+
+stack: clean-docker docker/ssl/ark-cert.pem
 	docker compose -p arkindex up --build
 
-services: docker/ssl/ark-cert.pem
+services: clean-docker docker/ssl/ark-cert.pem
 	docker compose -p arkindex -f docker/docker-compose.services.yml up
 
 docker/ssl/ark-cert.pem: