rofi: switch to home-manager options with catppuccin macchiato theme

Replace manual xdg.configFile symlinks and fetchFromGitHub theme fetching
with programs.rofi options and the catppuccin/nix flake module. Also removes
unused pywal module from magicman.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

home/hosts/gunter/default.nix

@@ -17,6 +17,7 @@
       {
         imports = [
           inputs.sops-nix.homeManagerModules.sops
+          inputs.catppuccin.homeModules.catppuccin
           ../../editor/neovim
           ../../hyprland
           ../../packages

home/hosts/magicman/default.nix

@@ -17,6 +17,7 @@
       {
         imports = [
           inputs.sops-nix.homeManagerModules.sops
+          inputs.catppuccin.homeModules.catppuccin
           ../../sops
           ../../services/labmcp.nix
           ../../editor/neovim
@@ -28,7 +29,6 @@
           ../../programs/rofi
           ../../programs/obs-studio
           ../../programs/vscode
-          ../../programs/pywal
           ../../scripts
           ../../scripts/batlvl.nix
           ../../zsh