Add internationalization support with astro-i18next integration

- Implemented astro-i18next for multi-language support, including English, Dutch, and Italian.
- Configured default locale and language fallback settings.
- Defined routes for localized content in the configuration.
- Updated package.json and package-lock.json to include new dependencies for i18next and related plugins.

dist/robots.txt

@@ -0,0 +1,24 @@
+User-agent: *
+Allow: /
+Allow: /services
+Allow: /about  
+Allow: /contact
+Allow: /404
+Allow: /favicon.svg
+Allow: /manifest.json
+Disallow: /en
+Disallow: /en/
+Disallow: /nl
+Disallow: /nl/
+Disallow: /it
+Disallow: /it/
+
+# Sitemap
+Sitemap: https://tiber365.it/sitemap.xml
+
+# Crawl delay
+Crawl-delay: 1
+
+# Disallow admin or sensitive areas (if any in the future)
+# Disallow: /admin/
+# Disallow: /private/