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/pathe/dist/utils.d.ts

@@ -0,0 +1,5 @@
+declare function normalizeAliases(_aliases: Record<string, string>): Record<string, string>;
+declare function resolveAlias(path: string, aliases: Record<string, string>): string;
+declare function filename(path: string): string;
+
+export { filename, normalizeAliases, resolveAlias };