Redirect the root only when configured (#1270)

- Fix `’INFOSITE' is not recognized` in `npm start` on Windows

Close #1259

app.json

@@ -11,10 +11,6 @@
   "repository": "https://github.com/badges/shields",
   "logo": "http://shields.io/favicon.png",
   "env": {
-    "INFOSITE": {
-      "description": "The home page.",
-      "value": "/"
-    },
     "NPM_CONFIG_PRODUCTION": {
       "description": "Configure whether devDependencies are installed (they are needed for the build).",
       "value": "false"