matrix: remove long-gone dimension from well-known

Enable MSC3266 room summary API to enable room previews

Co-authored-by: teutat3s <teutates@mailbox.org>

modules/matrix/default.nix

@@ -124,6 +124,17 @@ in
         enable_room_list_search = true;
         encryption_enabled_by_default_for_room_type = "off";
         event_cache_size = "100K";
+
+        # https://github.com/element-hq/synapse/issues/11203
+        # No YAML deep-merge, so this needs to be in secret extraConfigFiles
+        # together with msc3861
+        #experimental_features = {
+        #  # Room summary API
+        #  msc3266_enabled = true;
+        #  # Rendezvous server for QR Code generation
+        #  msc4108_enabled = true;
+        #};
+
         federation_rr_transactions_per_room_per_second = 50;
         federation_client_minimum_tls_version = "1.2";
         forget_rooms_on_leave = true;

modules/nginx-matrix/default.nix

@@ -24,14 +24,6 @@ let
       secure_backup_required = false;
       secure_backup_setup_methods = [ ];
     };
-    "m.integrations" = {
-      managers = [
-        {
-          api_url = "https://dimension.${domain}/api/v1/scalar";
-          ui_url = "https://dimension.${domain}/element";
-        }
-      ];
-    };
   };
   wellKnownServer = domain: { "m.server" = "matrix.${domain}:8448"; };
   wellKnownSupport = {