Fix replacement URL for React getting started (#4571)

Author: MrChrisW

docs/content/getting-started.md

@@ -4,7 +4,7 @@ title: Getting started
 
 import DeprecationBanner from '../components/DeprecationBanner'
 
-<DeprecationBanner replacementUrl={'/design/guides/development/react'} />
+<DeprecationBanner replacementUrl={'/guides/react'} />
 
 ## Installation