Add steam and 32bit support to shepard build

systems/x86_64/shepard/configuration.nix

@@ -4,4 +4,15 @@
     # Name your host machine
     networking.hostName = "shepard"; 
 
+    ## Enable 32 Bit libraries for applications like Steam
+    hardware.opengl.driSupport32Bit = true;
+
+    # Allow Unfree
+    nixpkgs.config.allowUnfree = true;
+
+    environment.systemPackages = 
+        with pkgs; 
+        [
+           steam
+        ]; 
 }