Remove survey link

Summary:
We have enough responses now and we are in the lockdown for improving the documentation.

We can add another "did we improve?" survey after lockdown sometime.
Closes https://github.com/facebook/react-native/pull/8260

Differential Revision: D3463284

Pulled By: JoelMarcey

fbshipit-source-id: f2d585a8aa6308de0cce0bea3974b1e7f14d5a6f

website/layout/DocsLayout.js

@@ -48,15 +48,6 @@ var DocsLayout = React.createClass({
               {metadata.previous && <a className="docs-prev" href={'docs/' + metadata.previous + '.html#content'}>&larr; Prev</a>}
               {metadata.next && <a className="docs-next" href={'docs/' + metadata.next + '.html#content'}>Next &rarr;</a>}
             </div>
-            <div className="survey">
-              <div className="survey-image" />
-              <p>
-                We are planning improvements to the React Native documentation. Your responses to this short survey will go a long way in helping us provide valuable content. Thank you!
-              </p>
-              <center>
-                <a className="button" href="https://www.facebook.com/survey?oid=681969738611332">Take Survey</a>
-              </center>
-            </div>
           </div>
         </section>
       </Site>

website/src/react-native/css/react-native.css

@@ -1373,45 +1373,12 @@ div[data-twttr-id] iframe {
   background-color: hsl(198, 100%, 94%);
 }
 
-.survey {
-  padding: 10px;
-  padding-top: 0;
-  background-color: rgba(5, 165, 209, 0.05);
-  border: 2px solid #05A5D1;
-  position: relative;
-}
-
-.survey-image {
-  float: left;
-  height: 128px;
-  width: 128px;
-  background-image: url('../img/survey.png');
-}
-
-.survey p {
-  margin-left: 130px;
-}
-
-.survey .button {
-  font-size: 24px;
-  background: #05A5D1;
-  color: #fafafa;
-}
-
 @media only screen
   and (max-device-width: 1024px) {
   #content {
     display: inline;
   }
 
-  .survey-image {
-    position: static;
-    margin: 10px auto;
-  }
-  .survey p {
-    margin-left: 0px;
-  }
-
   .container {
     min-width: 0;
     overflow: auto;