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.

node_modules/cross-fetch/dist/react-native-ponyfill.js

@@ -0,0 +1,6 @@
+module.exports = global.fetch // To enable: import fetch from 'cross-fetch'
+module.exports.default = global.fetch // For TypeScript consumers without esModuleInterop.
+module.exports.fetch = global.fetch // To enable: import {fetch} from 'cross-fetch'
+module.exports.Headers = global.Headers
+module.exports.Request = global.Request
+module.exports.Response = global.Response