Update dingserver

hosts/dingserver/configuration.nix

@@ -4,8 +4,9 @@
   imports =
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
-      ./synapse.nix
       ./caddy.nix
+      ./synapse.nix
+      ./syncthing.nix
     ];
 
   # Use the GRUB 2 boot loader.
@@ -26,12 +27,13 @@
 
   users.users.daniel = {
     isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
+    extraGroups = [ "wheel" "syncthing" ]; # Enable ‘sudo’ for the user.
   };
 
   environment.systemPackages = with pkgs; [
     curl
     git
+    helix
     kitty
     lazygit
     wget