Fix sample controllers

Backend/Controllers/APIController.php

@@ -5,7 +5,7 @@ class APIController extends Controller
 	protected array $paths = ['/api/sample'];
 	protected array $methods = ['POST'];
 
-	protected function execute(): void {
-		(new APIView())->render();
+	protected function execute(): View {
+		return new APIView();
 	}
 }

Backend/Controllers/HomeController.php

@@ -4,9 +4,9 @@ class HomeController extends Controller
 {
 	protected array $paths = ['/'];
 
-	protected function execute(): void {
+	protected function execute(): View {
 		$layout = new LayoutView();
 		$layout->addChild(new HeadingView('Home'));
-		$layout->render();
+		return $layout;
 	}
 }

Backend/Controllers/NotCalledController.php

@@ -4,14 +4,14 @@ class NotCalledController extends Controller
 {
 	protected array $paths = ['/:type/:id'];
 
-	protected function execute(): void {
+	protected function execute(): View {
 		$layout = new LayoutView();
 		$layout->addChild(new HeadingView('Doesn\'t get called when only using links from the LayoutView'));
 		$layout->addChild(new TextView('Go and work on the Router!'));
 		$layout->addChild(new TextView($this->param('type')));
 		if (($id = $this->param('id')) !== null)
 			$layout->addChild(new TextView("ID: $id"));
 
-		$layout->render();
+		return $layout;
 	}
 }

Backend/Controllers/SecondHome.php

@@ -4,13 +4,13 @@ class SecondHome extends Controller
 {
 	protected array $paths = ['/article/:id'];
 
-	protected function execute(): void {
+	protected function execute(): View {
 		$layout = new LayoutView();
 		$layout->addChild(new TextView('Welcome to another route'));
 		if (($id = $this->param('id')) !== null) {
 			$layout->addChild(new TextView("ID: $id"));
 		}
 
-		$layout->render();
+		return $layout;
 	}
 }