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/unsupportedIterableToArray.js

@@ -0,0 +1,9 @@
+var arrayLikeToArray = require("./arrayLikeToArray.js");
+function _unsupportedIterableToArray(r, a) {
+  if (r) {
+    if ("string" == typeof r) return arrayLikeToArray(r, a);
+    var t = {}.toString.call(r).slice(8, -1);
+    return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? arrayLikeToArray(r, a) : void 0;
+  }
+}
+module.exports = _unsupportedIterableToArray, module.exports.__esModule = true, module.exports["default"] = module.exports;