A few README fixes (flutter#20985)

* Few readme fixes

* Fix link

* Make casing consistent

Author: mit-mit

README.md

@@ -2,6 +2,9 @@
 [![Build Status - Cirrus](https://api.cirrus-ci.com/github/flutter/flutter.svg)](https://cirrus-ci.com/github/flutter/flutter/master)
 [![Coverage Status -](https://coveralls.io/repos/github/flutter/flutter/badge.svg?branch=master)](https://coveralls.io/github/flutter/flutter?branch=master)
 
+
+# Build beautiful native apps in record time
+
 Flutter is Google’s mobile app SDK for crafting high-quality native interfaces on iOS and Android in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.
 
 ### Documentation
@@ -20,9 +23,13 @@ without losing state, on
 emulators, simulators, and hardware for iOS
 and Android.
 
-<img src="https://user-images.githubusercontent.com/919717/28131204-0f8c3cda-66ee-11e7-9428-6a0513eac75d.gif" alt="Make a change in your code, and your app changes instantly.">
+<img src="https://raw.githubusercontent.com/flutter/website/master/src/images/intellij/hot-reload.gif" alt="Make a change in your code, and your app changes instantly.">
+
+## Expressive and flexible UI
+Quickly ship features with a focus on native end-user experiences.
+Layered architecture allows full customization, which results in incredibly
+fast rendering and expressive and flexible designs.
 
-## Expressive, beautiful UIs
 
 Delight your users with Flutter's built-in
 beautiful Material Design and