remove unused flake input

Author: izaac

flake.lock

@@ -8,10 +8,6 @@
       url = "github:nix-community/home-manager/master";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    catppuccin = {
-      url = "github:catppuccin/nix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
     sops-nix = {
       url = "github:Mic92/sops-nix";
       inputs.nixpkgs.follows = "nixpkgs";