Move all files to drupal-nix-flake/

drupal-nix-flake/web/modules/example/src/Controller/ExamplePageController.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Drupal\example\Controller;
+
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+final class ExamplePageController {
+
+  use StringTranslationTrait;
+
+  public function __invoke(): array {
+    return [
+      '#markup' => $this->t('This page is powered by Drupal and Nix.'),
+    ];
+  }
+
+}