move to mkModuleTree for host configuration

modules/system/boot/module.nix

@@ -0,0 +1,16 @@
+{pkgs, ...}: {
+  boot.loader = {
+    efi.canTouchEfiVariables = true;
+    grub = {
+      enable = true;
+      efiSupport = true;
+      device = "nodev";
+    };
+  };
+  boot.plymouth = {
+    enable = true;
+    # font = "${pkgs.jetbrains-mono}/share/fonts/truetype/JetBrainsMono-Regular.ttf";
+    themePackages = [pkgs.catppuccin-plymouth];
+    theme = "catppuccin-macchiato";
+  };
+}