refactor(flake): Now produces two packages based on enabled features

default.nix

@@ -1,4 +1,4 @@
-{ pkgs ? import <nixpkgs> { } }:
+{ pkgs ? import <nixpkgs> { }, features ? [ ] }:
 let manifest = (pkgs.lib.importTOML ./Cargo.toml).package;
 in
 pkgs.rustPlatform.buildRustPackage {
@@ -7,7 +7,7 @@ pkgs.rustPlatform.buildRustPackage {
   src = pkgs.lib.cleanSource ./.;
 
   cargoLock.lockFile = ./Cargo.lock;
-  buildFeatures = [ "lolcat" ];
+  buildFeatures = features;
   
   nativeBuildInputs = [
     pkgs.pkg-config

flake.nix

@@ -11,6 +11,7 @@
     in {
       packages = forAllSystems (system: {
         default = pkgsFor.${system}.callPackage ./. { };
+        lolcat = pkgsFor.${system}.callPackage ./. { features = [ "lolcat" ]; };
       });
     };
 }