make all file names lowercase

system/makefiles/help.md

@@ -0,0 +1,20 @@
+---
+title: "make help target"
+tags: [ "system", "make", "help" ]
+---
+
+Make your first target 'help' to give an overview of the main targets.
+Running `make help` will search for text which starts with `## ` and show what that target does.
+
+```make
+.PHONY: help
+help: ## Print the help message.
+	@awk 'BEGIN {FS = ":.*?## "} /^[0-9a-zA-Z._-]+:.*?## / {printf "\033[36m%s\033[0m : %s\n", $$1, $$2}' $(MAKEFILE_LIST) | \
+		sort | \
+		column -s ':' -t
+
+.PHONY: clean
+clean: ## Remove generated files.
+	$(RM) $(defaults)
+```
+