feat: write plymouth module

modules/core/default.nix

@@ -9,6 +9,7 @@
     ++ [ (import ./network.nix) ]
     ++ [ (import ./pipewire.nix) ]
     ++ [ (import ./program.nix) ]
+    ++ [ (import ./plymouth.nix) ]
     ++ [ (import ./sshd.nix) ]
     ++ [ (import ./security.nix) ]
     ++ [ (import ./services.nix) ]

modules/core/plymouth.nix

@@ -0,0 +1,23 @@
+{
+  pkgs,
+  lib,
+  ...
+}:
+{
+  # TODO: add https://github.com/FraioVeio/plymouth-xp-theme
+  boot.loader.timeout = 1;
+  boot.plymouth = {
+    enable = lib.mkDefault true;
+    themePackages = with pkgs; [
+      # By default we would install all themes
+      (adi1090x-plymouth-themes.override {
+        selected_themes = [ "lone" ];
+        # selected_themes = [ "sliced" ];
+        # selected_themes = [ "rings" ];
+        # selected_themes = [ "red_loader" ];
+        # selected_themes = [ "dna" ];
+        # selected_themes = [ "hexagon_dots" ];
+      })
+    ];
+  };
+}