feat: use new docs index for search

Use the index for the new docs site and rewrite the returned URLs so
they do not include the domain and point to where the website is being
executed.

views/layouts/main.hbs

@@ -25,9 +25,14 @@
     <script src="{{static-asset "js" "index.js"}}"></script>
     <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script>
     <script type="text/javascript"> docsearch({
-      apiKey: 'c9e8f898b3b32afe40f0a96637e7ea85',
-      indexName: 'electronjs',
+      apiKey: 'f9fb1d51a99fc479d5979cfa2aae48b9',
+      indexName: 'beta-electronjs',
       inputSelector: '#search-input',
+      transformData: (hits)=>{
+        for(let i = 0; i<hits.length;i++){
+          hits[i].url = hits[i].url.replace('https://beta.electronjs.org', '');
+        }
+      },
       debug: false // Set debug to true if you want to inspect the dropdown
     });
 </script>