add healthz, docker fixes, minor readme tweaks

Makefile

@@ -19,26 +19,26 @@ help:
 # Build the Docker images
 build:
 	@echo "Building Docker images..."
-	docker-compose build
+	docker compose build
 
 # Start all services
 up:
 	@echo "Starting all services..."
-	docker-compose up -d
+	docker compose up -d
 
 # Start only the database
 db-only:
 	@echo "Starting only the database..."
-	docker-compose up -d postgres
+	docker compose up -d postgres
 
 # Show logs from all services
 logs:
 	@echo "Showing logs from all services..."
-	docker-compose logs -f
+	docker compose logs -f
 
 # Clean up everything (containers, images, volumes)
 clean:
 	@echo "Cleaning up all Docker resources..."
-	docker-compose down -v --rmi all
+	docker compose down -v --rmi all