Restructure project for security and offline capability

- Move content outside public web root for security
- Consolidate all code and assets in engine/ directory
- Download Bootstrap locally for offline functionality
- Update public/ to contain only entry point files
- Add router.php for PHP development server security
- Update README.md with new structure and setup instructions
- Block direct access to content files via URL
- Maintain clean separation between content and code

engine/core/config.php

@@ -0,0 +1,16 @@
+<?php
+
+return [
+    'site_title' => 'CodePress',
+    'site_description' => 'A simple PHP CMS',
+    'base_url' => '/',
+    'content_dir' => __DIR__ . '/../../content',
+    'templates_dir' => __DIR__ . '/../templates',
+    'cache_dir' => __DIR__ . '/../../cache',
+    'default_page' => 'home',
+    'error_404' => '404',
+    'markdown_enabled' => true,
+    'php_enabled' => true,
+    'bootstrap_version' => '5.3.0',
+    'jquery_version' => '3.7.1'
+];