Update team.json

public/content/team.json

@@ -116,7 +116,7 @@
         "firstName": "Matthias",
         "lastName": "Betz",
         "jobTitle_en": "Researcher",
-        "imgUrl": "https://www.w3schools.com/w3images/avatar4.png",
+        "imgUrl": "https://www.hft-stuttgart.de/fileadmin/Dateien/Profilbilder/_processed_/9/6/csm_passbild_8f16c0f011.png",
         "profile_link": "https://www.hft-stuttgart.de/p/Matthias-Betz",
         "researchTopics": ""
     },