Update Makefile

Author: wyfcyx

Makefile

@@ -1,19 +1,8 @@
 DOCKER_NAME ?= dinghao188/rcore-tutorial
 .PHONY: docker build_docker
-all:
-	make -C usr user_img
-	make -C os build
-run:
-	make -C usr user_img
-	make -C os run
-clean:
-	make -C usr clean
-	make -C os clean
-env:
-	make -C os env
 
 docker:
 	docker run --rm -it --mount type=bind,source=$(shell pwd),destination=/mnt ${DOCKER_NAME}
 
 build_docker: 
-	docker build -t ${DOCKER_NAME} .
+	docker build -t ${DOCKER_NAME} .