Add secure public directory structure with .htaccess

- Created public/ directory for web-accessible files
- Moved content and assets to public/ subdirectories
- Added .htaccess files for security and routing
- Updated config.php to use public/content path
- Blocked direct access to PHP files and sensitive directories
- Added URL routing to index.php
- Enhanced security headers and PHP settings

config.php

@@ -4,7 +4,7 @@ return [
     'site_title' => 'CodePress',
     'site_description' => 'A simple PHP CMS',
     'base_url' => '/',
-    'content_dir' => __DIR__ . '/content',
+    'content_dir' => __DIR__ . '/public/content',
     'templates_dir' => __DIR__ . '/templates',
     'cache_dir' => __DIR__ . '/cache',
     'default_page' => 'home',