feat: enhance SEO and metadata for DevLab

- Updated the title and meta tags to improve search engine optimization and provide a clearer description of the application.
- Added Open Graph and Twitter Card metadata for better social media sharing.
- Included structured data (JSON-LD) to enhance visibility in search results and provide detailed information about the application.

public/robots.txt

@@ -0,0 +1,10 @@
+# robots.txt for DevLab
+User-agent: *
+Allow: /
+
+# Sitemap location
+Sitemap: https://dev-lab.onixbyte.dev/sitemap.xml
+
+# Disallow admin or private areas if any
+# Disallow: /admin/
+# Disallow: /private/