feat: upgrade ekman to new cluster structure

ekman/fs-backup/default.nix

@@ -60,7 +60,7 @@ in {
       mounts = {
         rdma.enable = false;
         automount.enable = true;
-        home = false;
+        users = false;
         opt = false;
         work = false;
         data = false;
@@ -172,7 +172,7 @@ in {
 
     imports = [
       ./hardware-configuration.nix
-      ../cluster.nix
+      ../default.nix
       ../mounts.nix
     ];
   };