Update config.sample.json (#3001)

Co-authored-by: Hugh Nimmo-Smith <[email protected]>
Co-authored-by: Hugh Nimmo-Smith <[email protected]>

Author: escix

config/config.sample.json

@@ -1,10 +1,13 @@
 {
   "default_server_config": {
     "m.homeserver": {
-      "base_url": "http://synapse.localhost:8008",
-      "server_name": "synapse.localhost"
+      "base_url": "https://mydomain.com",
+      "server_name": "mydomain.com"
     }
   },
+  "livekit": {
+    "livekit_service_url": "https://livekit-jwt.mydomain.com"
+  },
   "features": {
     "feature_use_device_session_member_events": true
   },