Remove Black Friday notification

docs/notifications.json

@@ -13,10 +13,5 @@
     "id": 83,
     "title": "Material UI v6 is out now",
     "text": "This major release includes CSS variables support, experimental opt-in CSS extraction, and many more improvements. Check out the <a style=\"color: inherit;\" data-ga-event-category=\"Announcement\" data-ga-event-action=\"notification\" data-ga-event-label=\"material-ui-v6\" href=\"https://mui.com/blog/material-ui-v6-is-out/\">announcement blog post</a>."
-  },
-  {
-    "id": 84,
-    "title": "Black Friday is here!",
-    "text": "Don&#39;t miss out on the best deals of the year—Mega Bundles with up to 90% off. Available for a limited time. <a style=\"color: inherit;\" data-ga-event-category=\"Announcement\" data-ga-event-action=\"notification\" data-ga-event-label=\"black-friday\" href=\"https://mui.com/store/bundles/\">Check the offers</a>!"
   }
 ]