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/esm/classApplyDescriptorDestructureSet.js

@@ -0,0 +1,10 @@
+function _classApplyDescriptorDestructureSet(e, t) {
+  if (t.set) return "__destrObj" in t || (t.__destrObj = {
+    set value(r) {
+      t.set.call(e, r);
+    }
+  }), t.__destrObj;
+  if (!t.writable) throw new TypeError("attempted to set read only private field");
+  return t;
+}
+export { _classApplyDescriptorDestructureSet as default };