add chapter about data repositories, and start work on perfomance chapter

implementation/16-data-repository/config/settings.php

@@ -0,0 +1,12 @@
+<?php declare(strict_types=1);
+
+use Lubian\NoFramework\Settings;
+
+return new Settings(
+    environment: 'prod',
+    dependenciesFile: __DIR__ . '/dependencies.php',
+    middlewaresFile: __DIR__ . '/middlewares.php',
+    templateDir: __DIR__ . '/../templates',
+    templateExtension: '.html',
+    pagesPath: __DIR__ . '/../data/pages/',
+);