refactor: split common/nixos.nix and -/home.nix

Split these big files into modular files that
are easier to share and read on their own.

profiles/common/nixos/hardware.nix

@@ -0,0 +1,26 @@
+{ pkgs, ... }:
+{
+
+  hardware = {
+    graphics = {
+      enable = true;
+      enable32Bit = true;
+    };
+
+    pulseaudio = {
+      enable = true;
+      package = pkgs.pulseaudioFull;
+    };
+
+    enableAllFirmware = true;
+
+    bluetooth = {
+      powerOnBoot = true;
+      settings = {
+        General = {
+          Enable = "Source,Sink,Media,Socket";
+        };
+      };
+    };
+  };
+}