modules: hardware: put modules into folders

modules/hardware/default.nix

@@ -3,11 +3,11 @@
 
 {
   imports = [
-    ./bluetooth.nix
-    ./ergodox.nix
-    ./mx-ergo.nix
-    ./networking.nix
-    ./sound.nix
-    ./upower.nix
+    ./bluetooth
+    ./ergodox
+    ./mx-ergo
+    ./networking
+    ./sound
+    ./upower
   ];
 }