fixup! EDU-1954: Adds trimmed install and usage sections

Author: franrob-projects

README.md

@@ -21,7 +21,7 @@ Find out more:
 
 Everything you need to get started with Ably:
 
-* [Quickstart in Pub/Sub using Flutter.](https://ably.com/docs/getting-started/quickstart?lang=flutter)
+* [Getting started in Pub/Sub using Flutter.](https://ably.com/docs/getting-started/flutter)
 * [SDK Setup for Flutter.](https://ably.com/docs/getting-started/setup?lang=flutter)
 
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