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/tsRewriteRelativeImportExtensions.js

@@ -0,0 +1,6 @@
+function tsRewriteRelativeImportExtensions(t, e) {
+  return "string" == typeof t && /^\.\.?\//.test(t) ? t.replace(/\.(tsx)$|((?:\.d)?)((?:\.[^./]+)?)\.([cm]?)ts$/i, function (t, s, r, n, o) {
+    return s ? e ? ".jsx" : ".js" : !r || n && o ? r + n + "." + o.toLowerCase() + "js" : t;
+  }) : t;
+}
+module.exports = tsRewriteRelativeImportExtensions, module.exports.__esModule = true, module.exports["default"] = module.exports;