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/plugin-tsm/lib/index.cjs

@@ -0,0 +1,9 @@
+module.exports = {
+    name: '@proload/plugin-tsm',
+    extensions: ['ts', 'tsx', 'cts', 'mts'],
+    async register(fileName) {
+        if (/\.([cm]ts|tsx?)$/.test(fileName)) {
+            require('tsm');
+        }
+    }
+}