work on basic CRUDController and improve configuration

Controller/AdminCountryCRUDController.php

@@ -17,27 +17,4 @@ class AdminCountryCRUDController extends CRUDController
     {
         $this->paginatorFactory = $paginator;
     }
-
-    protected function getEntity(): string
-    {
-        return Country::class;
-    }
-
-    protected function orderingOptions(): array
-    {
-        return [
-            'countryCode' => 'ASC'
-        ];
-    }
-    
-    protected function getTemplateParameters($action): array
-    {
-        switch ($action) {
-            case 'index':
-                return [ 
-                    'columns' => [ 'countryCode', 'name' ],
-                    'title' => 'Liste des pays'
-                    ];
-        }
-    }
 }