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/checkInRHS.js

@@ -0,0 +1,6 @@
+var _typeof = require("./typeof.js")["default"];
+function _checkInRHS(e) {
+  if (Object(e) !== e) throw TypeError("right-hand side of 'in' should be an object, got " + (null !== e ? _typeof(e) : "null"));
+  return e;
+}
+module.exports = _checkInRHS, module.exports.__esModule = true, module.exports["default"] = module.exports;