Inline controls for docs

Summary:
Adding inline controls in markdown using:
```
<controls prop="flexWrap"></controls>
```

Reviewed By: emilsjolander

Differential Revision: D6987150

fbshipit-source-id: 28def12df702ba5d5d5b6a83dd1cb907716d1b1c

website/contents/properties/width-height.md

@@ -2,7 +2,11 @@
 path: "docs/width-height"
 title: "Width and Height"
 hasPlayground: true
-editableProperties: ['width', 'height']
 ---
 
-## Width and Height
+## Width and Height
+
+
+<controls prop="width"></controls>
+
+<controls prop="height"></controls>