Initial Rector fixes with basic configuration

rector.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return RectorConfig::configure()
+    ->withPaths([
+        __DIR__ . '/app',
+        __DIR__ . '/fixtures',
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+        __DIR__ . '/web',
+    ])
+    ->withImportNames(importShortClasses: false)
+    ->withTypeCoverageLevel(0);