Merge branch 'main' of https://github.com/reactjs/reactjs.org into sync-7a6a6282

Author: docschina-bot

content/community/videos.md

@@ -10,6 +10,11 @@ redirect_from:
 
 专门讨论 React 和 React 生态系统的视频。
 
+### React Conf 2021 {#react-conf-2021}
+
+A playlist of videos from React Conf 2021.
+<iframe title="React Conf 2021" width="650" height="366" src="https://www.youtube-nocookie.com/embed/videoseries?list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa" frameborder="0" allowfullscreen></iframe>
+
 ### React Conf 2019 {#react-conf-2019}
 
 2019 年 React Conf 的视频播放列表。