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/@babel/runtime/helpers/esm/defaults.js

@@ -0,0 +1,9 @@
+function _defaults(e, r) {
+  for (var t = Object.getOwnPropertyNames(r), o = 0; o < t.length; o++) {
+    var n = t[o],
+      a = Object.getOwnPropertyDescriptor(r, n);
+    a && a.configurable && void 0 === e[n] && Object.defineProperty(e, n, a);
+  }
+  return e;
+}
+export { _defaults as default };