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/deepmerge/.editorconfig

@@ -0,0 +1,7 @@
+root = true
+
+[*]
+indent_style = tab
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true