Update Makefile to use grep -h for help target output

Author: tacxou

Makefile

@@ -13,7 +13,7 @@ include .env
 .PHONY: help build dev install exec pkg dbs openldap stop stop-all
 help:
 	@printf "\033[33mUsage:\033[0m\n  make [target] [arg=\"val\"...]\n\n\033[33mTargets:\033[0m\n"
-	@grep -E '^[-a-zA-Z0-9_\.\/]+:.*?## .*$$' $(MAKEFILE_LIST) \
+	@grep -h -E '^[-a-zA-Z0-9_\.\/]+:.*?## .*$$' $(MAKEFILE_LIST) \
 		| sort | awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[32m%-15s\033[0m %s\n", $$1, $$2}'
 
 build: ## Build the container