Updating shell.nix to a more simple mkShell.

.vscode/settings.json

@@ -1,4 +1,5 @@
 {
+    "nixEnvSelector.suggestion": false,
     "nixEnvSelector.nixFile": "${workspaceFolder}/shell.nix",
     "nixEnvSelector.useFlakes": false
 }

shell.nix

@@ -1,19 +1,20 @@
 with import <nixpkgs> {};
-stdenv.mkDerivation {
-  name = "env";
-  nativeBuildInputs = [
+pkgs.mkShell {
+  buildInputs = [
+    # Tools
     gnumake
     gcc
     gdb
     pkg-config
     valgrind
-  ];
-  buildInputs = [
+
+    # Libs
     libpng
     json_c
     sdl3
     ncurses
   ];
+
   shellHook = ''
     export LD_LIBRARY_PATH=${pkgs.libpng}/lib:${pkgs.sdl3}/lib:${pkgs.ncurses}/lib:$LD_LIBRARY_PATH
     export PKG_CONFIG_PATH=${pkgs.libpng}/lib/pkgconfig:${pkgs.sdl3}/lib/pkgconfig:${pkgs.ncurses}/lib/pkgconfig:$PKG_CONFIG_PATH