Use MicroKernelTrait to bootstrap application. Rewrote routes, controllers and structure of application a bit. Including use of twig.

src/Controller/CategoryController.php

@@ -3,10 +3,13 @@
 namespace Krzysiej\RyobiCrawler\Controller;
 
 use Krzysiej\RyobiCrawler\Models\Product;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
 
 final class CategoryController extends BaseController
 {
-    public function __invoke(string $category): void
+    #[Route('/category/{category}', name: 'app_category')]
+    public function __invoke(string $category): Response
     {
         $products = Product::with('price')
             ->selectRaw('products.*')
@@ -15,6 +18,6 @@ final class CategoryController extends BaseController
             ->orderByDesc('starred')
             ->orderByDesc('created_by')
             ->get();
-        $this->twig->display('productList.html.twig', ['products' => $products]);
+        return $this->render('productList.html.twig', ['products' => $products]);
     }
 }