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/objectSpread.js

@@ -0,0 +1,14 @@
+var defineProperty = require("./defineProperty.js");
+function _objectSpread(e) {
+  for (var r = 1; r < arguments.length; r++) {
+    var t = null != arguments[r] ? Object(arguments[r]) : {},
+      o = Object.keys(t);
+    "function" == typeof Object.getOwnPropertySymbols && o.push.apply(o, Object.getOwnPropertySymbols(t).filter(function (e) {
+      return Object.getOwnPropertyDescriptor(t, e).enumerable;
+    })), o.forEach(function (r) {
+      defineProperty(e, r, t[r]);
+    });
+  }
+  return e;
+}
+module.exports = _objectSpread, module.exports.__esModule = true, module.exports["default"] = module.exports;