restructure naming scheme

hosts/snowbelle/configuration.nix

@@ -5,13 +5,14 @@
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
       ../../users/users.nix
-      ../../modules/system/system.nix
-      ../../modules/homelab/homelab.nix
+      ../../modules/system/default.nix
+      ../../modules/homelab/default.nix
     ];
 
   modules = {
     system = {
       ssh.enable = true;
+      sops.enable = true;
       docker.enable = true;
       syncthing.enable = true;
       tailscale.enable = true;