Add multiple blog posts and enhance sitemap generation

- Created new blog posts:
  - "10 essential plugins for your next.js project"
  - "4 ways to improve your website's performance"
  - "How to create a blog with gatsby.js"
  - "How to create a CLI tool with Node.js"
  - "How to move your blog from WordPress.com to self-hosted in 3 easy steps"
  - "How to optimize your website for SEO (step-by-step)"
  - "The pros and cons of monolithic vs. microservices architecture"

- Implemented sitemap generation for blog posts, projects, and tags with dynamic URLs and metadata.

package.json

@@ -20,7 +20,7 @@
   "homepage": "https://cojocarudavid.me",
   "name": "cojocarudavid.me",
   "type": "module",
-  "version": "1.0.4",
+  "version": "1.0.6",
   "private": false,
   "scripts": {
     "dev": "astro dev",