remove reference of featureflag endpoint (#1461)

Author: julianocosta89

Makefile

@@ -131,7 +131,6 @@ start:
 	@echo "Go to http://localhost:8080/jaeger/ui for the Jaeger UI."
 	@echo "Go to http://localhost:8080/grafana/ for the Grafana UI."
 	@echo "Go to http://localhost:8080/loadgen/ for the Load Generator UI."
-	@echo "Go to http://localhost:8080/feature/ for the Feature Flag UI."
 
 .PHONY: start-minimal
 start-minimal:
@@ -153,7 +152,6 @@ start-odd:
 	@echo "Go to http://localhost:8080/jaeger/ui for the Jaeger UI."
 	@echo "Go to http://localhost:8080/grafana/ for the Grafana UI."
 	@echo "Go to http://localhost:8080/loadgen/ for the Load Generator UI."
-	@echo "Go to http://localhost:8080/feature/ for the Feature Flag UI."
 	@echo "Go to http://localhost:11633/ for the Tracetest Web UI."
 
 .PHONY: stop