Run eslint --fix

Summary:
CI is currently failing because of a lint issue, this fixes it and a bunch of other warnings that are auto-fixable.

**Test plan**
Quick manual test, cosmetic changes only.
Closes https://github.com/facebook/react-native/pull/16229

Differential Revision: D6009748

Pulled By: TheSavior

fbshipit-source-id: cabd44fed99dd90bd0b35626492719c139c89f34

website/core/BlogPostFooter.js

@@ -31,7 +31,7 @@ class BlogPostFooter extends React.Component {
       <div>
         <aside className="author-info">
           <div className="author-image">
-            <span className="the-image" style={{backgroundImage: "url(" + authorImage + ")"}}></span>
+            <span className="the-image" style={{backgroundImage: 'url(' + authorImage + ')'}} />
           </div>
           <p className="posted-on">Posted on <BlogPostDate post={post} /></p>
           <p className="name-title">
@@ -50,9 +50,8 @@ class BlogPostFooter extends React.Component {
               data-layout="standard"
               data-share="true"
               data-width="225"
-              data-show-faces="false">
-            </div>
-            <a href="https://twitter.com/share" className="twitter-share-button" data-text={post.title} data-url={"http://facebook.github.io/react-native/blog/" + post.path} data-via={post.authorTwitter} data-related="reactnative" data-show-count="false">Tweet</a>
+              data-show-faces="false" />
+            <a href="https://twitter.com/share" className="twitter-share-button" data-text={post.title} data-url={'http://facebook.github.io/react-native/blog/' + post.path} data-via={post.authorTwitter} data-related="reactnative" data-show-count="false">Tweet</a>
           </div>
         </aside>
       </div>

website/core/BlogPostHeader.js

@@ -24,18 +24,18 @@ class BlogPostHeader extends React.Component {
     }
 
     var title = post.title;
-    var href = "/react-native/blog/" + post.path;
+    var href = '/react-native/blog/' + post.path;
     if (this.props.excerpt) {
       title = <a href={href}>{post.title}</a>;
       hero = <a href={href}>{hero}</a>;
     }
 
     if (post.youtubeVideoId) {
-      var embedURL = "https://www.youtube.com/embed/" + post.youtubeVideoId;
+      var embedURL = 'https://www.youtube.com/embed/' + post.youtubeVideoId;
       hero = <div className="video-container youtube">
                <iframe id="ytplayer" type="text/html" width="650" height="345"
         src={embedURL}
-        frameBorder="0"></iframe>
+        frameBorder="0" />
               </div>;
     }
 

website/core/ExcerptLink.js

@@ -15,10 +15,10 @@ var React = require('React');
 
 class ExcerptLink extends React.Component {
   render() {
-    var cta = "Read more";
+    var cta = 'Read more';
 
-    if (this.props.category === "videos") {
-      cta = "Watch video";
+    if (this.props.category === 'videos') {
+      cta = 'Watch video';
     }
 
     return (