add kids svg background

Author: psmorgan

src/styles/gradients.scss

@@ -64,6 +64,7 @@
 }
 
 .polaris-bg-sky-kids {
+    background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiIHZpZXdCb3g9IjAgMCAxIDEiIHByZXNlcnZlQXNwZWN0UmF0aW89Im5vbmUiPgo8cmFkaWFsR3JhZGllbnQgaWQ9Imc5ODMiIGdyYWRpZW50VW5pdHM9InVzZXJTcGFjZU9uVXNlIiBjeD0iNTAlIiBjeT0iNTAlIiByPSI1MCUiPgo8c3RvcCBzdG9wLWNvbG9yPSIjNjUyRDlGIiBvZmZzZXQ9IjAiLz48c3RvcCBzdG9wLWNvbG9yPSIjNEIwMDdFIiBvZmZzZXQ9IjEiLz4KPC9yYWRpYWxHcmFkaWVudD4KPHJlY3QgeD0iLTUwIiB5PSItNTAiIHdpZHRoPSIxMDEiIGhlaWdodD0iMTAxIiBmaWxsPSJ1cmwoI2c5ODMpIiAvPgo8L3N2Zz4=);
     @include page-background-gradient($polaris-bg-sky-kids);
 }