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>

flake.nix

@@ -32,6 +32,9 @@
       url = "git+https://git.t-juice.club/torjus/natstonotify?ref=master";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    catppuccin = {
+      url = "github:catppuccin/nix";
+    };
   };
 
   outputs =
@@ -45,6 +48,7 @@
       huecli,
       natstonotify,
       nix-packages,
+      catppuccin,
       ...
     }@inputs:
     let