upgrade yoga-layout

Summary:
- upgraded to yoga-layout@1.9.3
- set default values correctly
- catch errors

Reviewed By: emilsjolander

Differential Revision: D7001154

fbshipit-source-id: 49527576c61ce109ba0af0f50c981cf5c2c7d41a

website/package.json

@@ -18,7 +18,7 @@
     "immutable": "^4.0.0-rc.9",
     "react-helmet": "^5.2.0",
     "react-syntax-highlighter": "^7.0.0",
-    "yoga-layout": "^1.9.0"
+    "yoga-layout": "^1.9.3"
   },
   "keywords": [
     "gatsby"