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/_redirects

@@ -0,0 +1,7 @@
+# Redirect language routes to root
+/en/* / 301
+/nl/* / 301  
+/it/* / 301
+/en / 301
+/nl / 301
+/it / 301