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/core/class/SimpleTemplate.php

@@ -37,6 +37,16 @@ class SimpleTemplate {
         // Handle partial includes first ({{>partial}})
         $template = preg_replace_callback('/{{>([^}]+)}}/', [$this, 'replacePartial'], $template);
         
+        // Handle equal conditionals first
+        $template = preg_replace_callback('/{{#equal\s+(\w+)\s+["\']([^"\']+)["\']}}(.*?){{\/equal}}/s', function($matches) {
+            $key = $matches[1];
+            $expectedValue = $matches[2];
+            $content = $matches[3];
+            
+            $actualValue = $this->data[$key] ?? '';
+            return ($actualValue === $expectedValue) ? $content : '';
+        }, $template);
+        
         // Handle conditional blocks
         foreach ($this->data as $key => $value) {
             if (is_array($value)) {