Remove Plymouth, add quiet boot params, add cpu-performance module

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/eda71495-cd38-4408-8d3b-b9d793f6445f

Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

iso/branding.nix

@@ -1,12 +0,0 @@
-{ config, pkgs, lib, ... }:
-
-let
-  theme = pkgs.callPackage ./plymouth-theme.nix {};
-in
-{
-  boot.plymouth.enable = true;
-  boot.plymouth.theme = "sovran";
-  boot.plymouth.themePackages = [ theme ];
-  boot.kernelParams = [ "quiet" "splash" ];
-  boot.initrd.systemd.enable = true;
-}

iso/plymouth-theme.nix

@@ -1,39 +0,0 @@
-{ pkgs, lib }:
-
-pkgs.stdenv.mkDerivation {
-  pname = "sovran-plymouth-theme";
-  version = "1.0";
-
-  src = ./.;
-
-  installPhase = ''
-    mkdir -p $out/share/plymouth/themes/sovran
-    cp ${./assets/splash-logo.png} $out/share/plymouth/themes/sovran/logo.png
-
-    cat > $out/share/plymouth/themes/sovran/sovran.plymouth <<EOF
-[Plymouth Theme]
-Name=Sovran Systems
-Description=Sovran Systems Splash
-ModuleName=script
-
-[script]
-ImageDir=$out/share/plymouth/themes/sovran
-ScriptFile=$out/share/plymouth/themes/sovran/sovran.script
-EOF
-
-    cat > $out/share/plymouth/themes/sovran/sovran.script <<'EOF'
-# Background color: #CFFFD7 (RGB 207,255,215)
-bg_r = 207/255.0
-bg_g = 255/255.0
-bg_b = 215/255.0
-
-Window.SetBackgroundTopColor (bg_r, bg_g, bg_b);
-Window.SetBackgroundBottomColor (bg_r, bg_g, bg_b);
-
-logo = Image("logo.png");
-logo_sprite = Sprite(logo);
-logo_sprite.SetX((Window.GetWidth() - logo.GetWidth()) / 2);
-logo_sprite.SetY((Window.GetHeight() - logo.GetHeight()) / 2);
-EOF
-  '';
-}