trailing slash option renamed

next.config.js

@@ -1,5 +1,5 @@
 module.exports = {
-    exportTrailingSlash: true,
+    trailingSlash: true,
     env: {
         APP_ARTICLES_PAGE_SIZE: 24,
         APP_CARD_DEFAULT_IMAGE: 'https://art.shlisselburg.org/static/img/main.jpg',