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/temporalRef.js

@@ -0,0 +1,6 @@
+var temporalUndefined = require("./temporalUndefined.js");
+var tdz = require("./tdz.js");
+function _temporalRef(r, e) {
+  return r === temporalUndefined ? tdz(e) : r;
+}
+module.exports = _temporalRef, module.exports.__esModule = true, module.exports["default"] = module.exports;