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/node-ponyfill.js

@@ -0,0 +1,22 @@
+const nodeFetch = require('node-fetch')
+const realFetch = nodeFetch.default || nodeFetch
+
+const fetch = function (url, options) {
+  // Support schemaless URIs on the server for parity with the browser.
+  // Ex: //github.com/ -> https://github.com/
+  if (/^\/\//.test(url)) {
+    url = 'https:' + url
+  }
+  return realFetch.call(this, url, options)
+}
+
+fetch.ponyfill = true
+
+module.exports = exports = fetch
+exports.fetch = fetch
+exports.Headers = nodeFetch.Headers
+exports.Request = nodeFetch.Request
+exports.Response = nodeFetch.Response
+
+// Needed for TypeScript consumers without esModuleInterop.
+exports.default = fetch