Update public/content/content.json

public/content/content.json

@@ -87,7 +87,8 @@
     "refIndex": 5,
     "links": {
       "demo": "https://w2.iaf-ex.hft-stuttgart.de/DigiTwins4PEDs/Stuttgart/",
-      "project": "https://www.hft-stuttgart.de/forschung/projekte/aktuell/digitwins4peds"
+      "project": "https://www.hft-stuttgart.de/forschung/projekte/aktuell/digitwins4peds",
+      "repo": "https://transfer.hft-stuttgart.de/gitlab/digitwins4peds/application"
     }
   },
   {