feat: use default symfony folder structure (#473)

Co-authored-by: Christopher Georg <[email protected]>

Author: Chris53897

src/Resources/config/menu.xml config/menu.xml

@@ -20,7 +20,7 @@ class KnpMenuExtension extends Extension implements PrependExtensionInterface
      */
     public function load(array $configs, ContainerBuilder $container): void
     {
-        $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
+        $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../../config'));
         $loader->load('menu.xml');
 
         $configuration = new Configuration();

src/Resources/config/schema/menu-1.0.xsd config/schema/menu-1.0.xsd

@@ -15,7 +15,7 @@ public function testConfigurationMatchesXsd($config): void
 
         $previousErrorSetting = \libxml_use_internal_errors(true);
 
-        $configIsValid = $configDom->schemaValidate(__DIR__.'/../../src/Resources/config/schema/menu-1.0.xsd');
+        $configIsValid = $configDom->schemaValidate(__DIR__.'/../../config/schema/menu-1.0.xsd');
         $errors = \array_map(function ($error) {
             return \sprintf('Line %d: %s', $error->line, \trim($error->message));
         }, \libxml_get_errors());