feat: add featured posts grid and update blog terminology

- Introduced a new FeaturedPostsGrid component to display featured posts on the homepage.
- Updated the Home component to fetch and render featured posts from the WordPress API.
- Changed instances of "بلاگ" to "دانشنامه" across various components for consistent terminology.

components/header.tsx

@@ -10,7 +10,7 @@ import { ThemeToggle } from '@/components/theme-toggle'
 
 const menuItems = [
     { name: 'صفحه اصلی', href: '/' },
-    { name: 'بلاگ', href: '/blog' },
+    { name: 'دانشنامه', href: '/blog' },
     { name: 'راه حل‌ها', href: '/solutions' },
     // { name: 'قیمت‌گذاری', href: '/pricing' },
     { name: 'درباره ما', href: '/about' },