Add React Conference Live 2021 (#3718)

* Add React Conference Live 2021

* Update conferences.md

Co-authored-by: Alexey Pyltsyn <lex61rus@gmail.com>

content/community/conferences.md

@@ -17,10 +17,15 @@ September 13-15, 2021. Atlanta, GA, USA
 
 [Website](https://renderatl.com) - [Twitter](https://twitter.com/renderATL) - [Instagram](https://www.instagram.com/renderatl/) - [Facebook](https://www.facebook.com/renderatl/) - [LinkedIn](https://www.linkedin.com/company/renderatl)
 
+### React Conference Live 2021 {#react-conference-live-2021} 
+October 7-8, 2021. In-person in Amsterdam, Netherlands + remote (hybrid event)
+
+[Website](https://www.reactlive.nl/) - [Twitter](https://twitter.com/reactlivenl) - [LinkedIn](https://www.linkedin.com/company/frontendlove/)
+
 ### React Advanced 2021 {#react-advanced-2021}
 October 22-23, 2021. In-person in London, UK + remote (hybrid event)
 
-[Website](https://reactadvanced.com) - [Twitter](http://twitter.com/reactadvanced) - [Facebook](https://www.facebook.com/ReactAdvanced) - [Videos](https://youtube.com/c/ReactConferences)
+[Website](https://reactadvanced.com) - [Twitter](https://twitter.com/reactadvanced) - [Facebook](https://www.facebook.com/ReactAdvanced) - [Videos](https://youtube.com/c/ReactConferences)
 
 ### React India 2021 {#react-india-2021}
 November 12-13, 2021 in Mumbai, India