prettify URL of the final web app

Author: IObert

standalone-approuter-html5-runtime-mta-hello-world/router/xs-app.json

@@ -1,11 +1,16 @@
 {
-  "welcomeFile": "/helloworldapprouter/index.html",
+  "welcomeFile": "/index.html",
   "authenticationMethod": "route",
   "routes": [
     {
       "source": "/user-api/currentUser$",
       "target": "/currentUser",
       "service": "sap-approuter-userapi"
+    },
+    {
+      "source": "(.*)",
+      "target": "/helloworldapprouter/$1",
+      "service": "html5-apps-repo-rt"
     }
   ]
 }