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/boot.nix

@@ -0,0 +1,32 @@
+{ ... }:
+{
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      efi.canTouchEfiVariables = true;
+    };
+
+    initrd = {
+      availableKernelModules = [
+        "nvme"
+        "sd_mod"
+        "sdhci_pci"
+        "usb_storage"
+        "usbhid"
+        "xhci_pci"
+      ];
+      kernelModules = [
+        "dm-snapshot"
+      ];
+      luks.devices.crypt = {
+        device = "/dev/nvme0n1p1";
+        preLVM = true;
+      };
+    };
+
+    kernelModules = [
+      "kvm-intel"
+    ];
+    extraModulePackages = [ ];
+  };
+}