fix url in websites videos page (#12196)

website/videos.json

@@ -11,7 +11,7 @@
       "title": "Aaron Abramov – Establishing Testing Patterns with Software Design Principles",
       "type": "youtube",
       "url": "https://www.youtube.com/embed/_pnW-JjmyXE",
-      "description": "[Aaron](https://twitter.com/aaronabramov_) shows how the lack of clarity about testing applications leads engineers to write low-quality tests that don’t catch bugs, break unnecessarily, and are hard to write."
+      "description": "[Aaron](https://twitter.com/aarondjents) shows how the lack of clarity about testing applications leads engineers to write low-quality tests that don’t catch bugs, break unnecessarily, and are hard to write."
     },
     {
       "title": "Snapshot testing - Anna Doubkova, React London 2017",