[#26] Added image cleaning recipe

Makefile

@@ -1,4 +1,4 @@
-all: debug
+all: debug logs
 .PHONY: all
 
 # Builds the debug release inside the Alpine container. For build caching, two
@@ -74,3 +74,7 @@ lint:
 docs:
 	@ cargo doc --no-deps
 .PHONY: docs
+
+# This recipe removes all chewingbever/fej images from your system
+clean-images:
+	@ docker images | grep '^chewingbever/fej' | sed 's/ \+/ /g' | cut -f3 -d' ' | xargs docker rmi