remove experimental-handlers examples, users should visit github.com/iris-contrib/middleware instead, let's not have duplications

Former-commit-id: 72754683d1bcd4325b5fcd9f57c6cb87f1d7337d

_examples/experimental-handlers/newrelic/simple/main.go

@@ -1,24 +0,0 @@
-package main
-
-import (
-	"github.com/kataras/iris"
-
-	"github.com/iris-contrib/middleware/newrelic"
-)
-
-func main() {
-	app := iris.New()
-	config := newrelic.Config("APP_SERVER_NAME", "NEWRELIC_LICENSE_KEY")
-	config.Enabled = true
-	m, err := newrelic.New(config)
-	if err != nil {
-		app.Logger().Fatal(err)
-	}
-	app.Use(m.ServeHTTP)
-
-	app.Get("/", func(ctx iris.Context) {
-		ctx.Writef("success!\n")
-	})
-
-	app.Run(iris.Addr(":8080"))
-}