new vision zero link

public/content/content.json

@@ -324,7 +324,7 @@
     },
     "links": {
       "youtube": "https://www.youtube.com/watch?v=T5jF20yXcWw",
-      "demo": "http://193.196.37.89:8083/visionzero/",
+      "demo": "https://gisjoe.com/apps/visionzero/index.html",
       "publication":"https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020",
       "project":"https://www.hft-stuttgart.de/forschung/i-city"
     },