update

public/content/content.json

@@ -112,7 +112,7 @@
     },
     "links": {
       "youtube": "https://www.youtube.com/watch?v=GzvrmpM9zmw",
-      "demo": "http://thunyatheps.com/icityebike/",
+      "demo": "https://icity.hft-stuttgart.de/icityebike/index.html",
       "publication":"https://doi.org/10.5194/isprs-annals-IV-4-W7-115-2018",
       "project":"https://www.hft-stuttgart.de/forschung/i-city"
     },