rework flake to include haskell build inputs

flake.nix

@@ -40,21 +40,14 @@
           };
         };
 
-        #devShell = packages.${packageName}.env;
+        devShell = haskellPackages.shellFor {
-        devShell = pkgs.mkShell {
+          packages = p: [ defaultPackage ];
+          withHoogle = true;
           buildInputs = with haskellPackages; [
             haskell-language-server
             ghcid
             cabal-install
-          ];
+          ] ++ (builtins.attrValues self.packages.${system});
-          nativeBuildInputs = with pkgs; [
-            pkg-config
-            glib
-            SDL2
-            freetype
-            glew
-          ];
-          inputsFrom = builtins.attrValues self.packages.${system};
         };
       });
 }