refactor: move 'disko' modules into 'modules/disko'

hosts/andromache/default.nix

@@ -17,7 +17,7 @@ in
     inputs.home-manager.nixosModules.default
     ./hard.nix
     ../../modules/bootloader.nix
-    (import ../../modules/disko.zfs-encrypted-root.nix {
+    (import ../../modules/disko/zfs-encrypted-root.nix {
       device = "/dev/nvme1n1";
       inherit lib;
       inherit config;

hosts/astyanax/default.nix

@@ -19,7 +19,7 @@ in
     inputs.home-manager.nixosModules.default
     ./hard.nix
     ../../modules/bootloader.nix
-    (import ../../modules/disko.zfs-encrypted-root.nix {
+    (import ../../modules/disko/zfs-encrypted-root.nix {
       inherit lib;
       inherit config;
       device = "/dev/nvme0n1";