docs: update url (#981)

Summary:
Updating url for react-native docs

Pull Request resolved: https://github.com/facebook/yoga/pull/981

Reviewed By: yungsters

Differential Revision: D40060061

Pulled By: yungsters

fbshipit-source-id: 7192b461cea007eb4c77789b92e911a62b21f0d3

website/contents/getting-started/standalone.md

@@ -12,7 +12,7 @@ Adding Yoga to a project is as simple as adding the dependency to your package m
 
 ```groovy
 dependencies {
-  compile 'com.facebook.yoga.android:yoga-layout:x.x.x'
+  implementation 'com.facebook.yoga.android:yoga-layout:x.x.x'
 }
 ```
 

website/src/pages/index.js

@@ -138,7 +138,7 @@ const AboutSectionOne = () => (
         <h3>ComponentKit</h3>
       </a>
       <a
-        href="http://facebook.github.io/react-native/"
+        href="https://reactnative.dev"
         target="_blank"
         className="logo">
         <img src={ReactNativeLogo} />