Add link to deuxfleurs jitsi in riot_web config

consul/configuration/chat/riot_web/config.json

@@ -8,7 +8,6 @@
     "brand": "Deuxfleurs",
     "integrations_ui_url": "https://scalar.vector.im/",
     "integrations_rest_url": "https://scalar.vector.im/api",
-    "integrations_jitsi_widget_url": "https://scalar.vector.im/api/widgets/jitsi.html",
     "bug_report_endpoint_url": "https://riot.im/bugreports/submit",
     "features": {
         "feature_groups": "labs",
@@ -19,5 +18,8 @@
     "default_theme": "light",
     "roomDirectory": {
         "servers": [ "im.deuxfleurs.fr", "matrix.org" ]
+    },
+    "jitsi": {
+        "preferredDomain": "jitsi.deuxfleurs.fr"
     }
 }