Merge pull request #16868 from github/fix-graphql-title-bug

GraphQL Explorer followups

Author: sarahs

layouts/graphql-explorer.html

@@ -15,6 +15,8 @@
               {% include breadcrumbs %}
             </div>
           </div>
+
+          <h1 class="border-bottom-0">{{ page.title }}</h1>
 
           <div class="mt-2">
             <div>

middleware/csp.js

@@ -38,6 +38,7 @@ module.exports = async (req, res, next) => {
       ],
       frameSrc: [ // exceptions for GraphQL Explorer
         'https://graphql-explorer.githubapp.com', // production env
+        'https://graphql.github.com/',
         'http://localhost:3000', // development env
         'https://www.youtube-nocookie.com'
       ],