Use a version-specific search

Summary:Algolia is now indexing each version of the docs, let's use it :)
Closes https://github.com/facebook/react-native/pull/6385

Differential Revision: D3031426

Pulled By: vjeux

fb-gh-sync-id: f06855bda304f491aaac28663c2d24b142a80d75
shipit-source-id: f06855bda304f491aaac28663c2d24b142a80d75

website/core/Site.js

@@ -17,6 +17,7 @@ var Site = React.createClass({
   render: function() {
     const path = Metadata.config.RN_DEPLOYMENT_PATH;
     const version = Metadata.config.RN_VERSION;
+    const algoliaVersion = version === 'next' ? 'master' : version;
     var basePath = '/react-native/' + (path ? path + '/' : '');
     var title = this.props.title ? this.props.title + ' – ' : '';
     var currentYear = (new Date()).getFullYear();
@@ -68,6 +69,7 @@ var Site = React.createClass({
           </div>
 
           <div id="fb-root" />
+          <script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script>
           <script dangerouslySetInnerHTML={{__html: `
             (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
             (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
@@ -79,8 +81,14 @@ var Site = React.createClass({
             !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)
             ){js=d.createElement(s);js.id=id;js.src="https://platform.twitter.com/widgets.js";
             fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");
+
+            docsearch({
+              apiKey: '2c98749b4a1e588efec53b2acec13025',
+              indexName: 'react-native-versions',
+              inputSelector: '#algolia-doc-search',
+              algoliaOptions: { facetFilters: [ "tags:${algoliaVersion}" ] }
+            });
           `}} />
-          <script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script>
           <script src="js/scripts.js" />
         </body>
       </html>

website/src/react-native/js/scripts.js

@@ -42,11 +42,4 @@
     modal.classList.remove('modal-open');
   }
 
-  // Algolia
-  docsearch({
-    apiKey: 'e3d767b736584dbe6d4c35f7cf7d4633',
-    indexName: 'react-native',
-    inputSelector: '#algolia-doc-search'
-  });
-
 }());