fix: source certificates into Gatsby (#39648)

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Co-authored-by: Shaun Hamilton <51722130+Sky020@users.noreply.github.com>

client/utils/gatsby/challengePageCreator.js

@@ -76,9 +76,6 @@ exports.createChallengePages = createPage => ({ node }, index, thisArray) => {
   } = node;
   // TODO: challengeType === 7 and isPrivate are the same, right? If so, we
   // should remove one of them.
-  if (challengeType === 7) {
-    return null;
-  }
 
   return createPage({
     path: slug,