Removed old avrdude reference, added clean action.

Makefile

@@ -8,7 +8,7 @@
 PROJECT_NAME = hello
 
 ARDUINO-CLI = arduino-cli
-AVRDUDE = avrdude
+RM = rm
 
 BIN = bin
 SRC = ${PROJECT_NAME}
@@ -36,6 +36,9 @@ setup:
 	# Fin
 	${ARDUINO-CLI} core update-index
 
+clean:
+	${RM} -r ${BIN}
+
 compile:
 	cd ${CWD}
 	${ARDUINO-CLI} compile --fqbn arduino:avr:leonardo ${SRC} --output-dir ${CWD}/${BIN}