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.

modules/projectproblog/classes/index.php

@@ -0,0 +1,8 @@
+<?php
+header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
+header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
+header('Cache-Control: no-store, no-cache, must-revalidate');
+header('Cache-Control: post-check=0, pre-check=0', false);
+header('Pragma: no-cache');
+header('Location: ../');
+exit;