fixed url in INSPIRER description

public/content/content.json

@@ -18,8 +18,8 @@
     },
     "refIndex": 5,
     "links": {
-      "demo": "https://kartta.hel.fi/3d/heating/Apps/Helsinki/view.html",
-      "publication": "https://doi.org/10.3390/ijgi9100602"
+      "demo": "https://urbanvis.hft-stuttgart.de/Testgebiete.html",
+      "publication": ""
     }
   },  
   {