Fix guide template variable replacement and enhance documentation

- Fix template variable replacement in guide pages by removing {{}} brackets
- Escape code blocks in guide markdown to prevent template processing
- Completely rewrite guide documentation with comprehensive CMS features
- Add bilingual guide support (English/Dutch) with detailed examples
- Enhance CodePressCMS core with improved guide page handling
- Update template system with better layout and footer components
- Improve language files with additional translations
- Update configuration with enhanced theme and language settings

Resolves issue where guide pages were showing replaced template variables
instead of displaying them as documentation examples.

engine/lang/nl.php

@@ -22,5 +22,18 @@ return [
     'page_not_found' => 'Pagina niet gevonden',
     'page_not_found_text' => 'De pagina die u zoekt bestaat niet.',
     'mappen' => 'Mappen',
-    'paginas' => 'Pagina\'s'
+    'paginas' => 'Pagina\'s',
+    'author_website' => 'Auteur website',
+    'author_git' => 'Auteur Git',
+    'plugins' => 'Plugins',
+    'templates' => 'Templates',
+    'layouts' => 'Layouts',
+    'sidebar_content' => 'Sidebar + Content',
+    'content_only' => 'Alleen Content',
+    'sidebar_only' => 'Alleen Sidebar',
+    'content_sidebar' => 'Content + Sidebar',
+    'plugin_development' => 'Plugin Ontwikkeling',
+    'template_system' => 'Template Systeem',
+    'mqtt_tracking' => 'MQTT Tracking',
+    'real_time_analytics' => 'Real-time Analytics'
 ];