Bump version to 1.5.0 with comprehensive documentation and plugin system

Major features and improvements:
- Fix critical guide template variable replacement bug
- Complete guide documentation rewrite with examples
- Implement plugin system with HTMLBlock and MQTTTracker plugins
- Enhanced bilingual support (NL/EN) throughout the system
- Improved template system with better layout options
- Enhanced security headers and code quality
- Updated documentation and configuration examples

Version 1.5.0 represents a significant milestone with improved
documentation, plugin architecture, and bug fixes.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "codepress",
-  "version": "1.0.0",
+  "version": "1.5.0",
   "description": "A lightweight, file-based Content Management System built with PHP and Bootstrap.",
   "main": "index.js",
   "scripts": {