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/@proload/core/lib/cjs/index.cjs

@@ -0,0 +1,8 @@
+const { ProloadError } = require('../error.cjs');
+function load(...args) {
+    return import('../esm/index.mjs').then(({ default: loader }) => loader(...args));
+}
+
+load.default = load;
+load.ProloadError = ProloadError;
+module.exports = load;