machines: rename to 'hosts/nixos'

This will be more consistent in the future if I want to introduce darwin
or home-manager configurations.

hosts/nixos/aramis/profiles.nix

@@ -0,0 +1,19 @@
+{ ... }:
+{
+  my.profiles = {
+    # Bluetooth configuration and GUI
+    bluetooth.enable = true;
+    # Mouse and keyboard configuration
+    devices.enable = true;
+    # GTK theme configuration
+    gtk.enable = true;
+    # Laptop specific configuration
+    laptop.enable = true;
+    # Printers are hell, but so is the unability to print
+    printing.enable = true;
+    # i3 configuration
+    wm.windowManager = "i3";
+    # X configuration
+    x.enable = true;
+  };
+}