Remove Curso do React Native implementando CRUD (#7092)

This link is not working

courses/free-courses-pt_BR.md

@@ -300,7 +300,6 @@
 ### React Native
 
 * [Aprenda React Native](https://www.youtube.com/playlist?list=PL8fIRnD1uUSnRqz3E2caAWDqbtIFXmNtW) - Canal Geek Dev (YouTube)
-* [Curso do React Native implementando CRUD](https://app.rocketseat.com.br/node/curso-react-native) - *registration required* (Rocketseat)
 
 
 ### Ruby