Merge pull request #150 from mozilla/readme-demo-link-tweaks

have GIF link to demo; tweak Demo heading

Author: delapuente

README.md

@@ -2,9 +2,9 @@
 
 Assets for creating [WebVR](https://webvr.rocks/)-enabled [Unity3D](https://unity3d.com/) projects.
 
-![Preview of Unity WebVR-exported project in the browser](https://raw.githubusercontent.com/mozilla/unity-webvr-export/master/img/preview.gif)
+**[Check out the demo now!](https://mozilla.github.io/unity-webvr-export/)**
 
-## **[Check out the demo now!](https://mozilla.github.io/unity-webvr-export/)**
+[![Preview of Unity WebVR-exported project in the browser](https://raw.githubusercontent.com/mozilla/unity-webvr-export/master/img/preview.gif)](https://mozilla.github.io/unity-webvr-export/)
 
 **[Free to download](https://assetstore.unity.com/packages/templates/systems/webvr-assets-109152)** and available now on the [Unity Asset Store](https://assetstore.unity.com/packages/templates/systems/webvr-assets-109152).