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/inheritsLoose.js

@@ -0,0 +1,5 @@
+var setPrototypeOf = require("./setPrototypeOf.js");
+function _inheritsLoose(t, o) {
+  t.prototype = Object.create(o.prototype), t.prototype.constructor = t, setPrototypeOf(t, o);
+}
+module.exports = _inheritsLoose, module.exports.__esModule = true, module.exports["default"] = module.exports;