Fix "Access-Control-Allow-Origin"-error on Safari browser

in Safari browser the site stays empty.

for JSONP request, jsonp=js_function must be passed,
or when callback=? passed, then jQuery replace it with temp method name.

jQuery API:

If the URL includes the string "callback=?" (or similar, as defined by the
server-side API), the request is treated as JSONP instead.

Change-Id: Ia19bb2bd0b7e6a391c5f8c349920189e7671a1d9

website/releases/index.html

@@ -39,7 +39,7 @@
 
 <script>
 $.getJSON(
-'https://www.googleapis.com/storage/v1beta2/b/gerrit-releases/o?projection=noAcl&fields=items(name%2Csize)',
+'https://www.googleapis.com/storage/v1beta2/b/gerrit-releases/o?projection=noAcl&fields=items(name%2Csize)&callback=?',
 function(data) {
   var doc = document;
   var frg = doc.createDocumentFragment();