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/plugins/fcc-source-challenges/gatsby-node.js

@@ -69,7 +69,6 @@ File changed at ${filePath}, replacing challengeNode id ${challenge.id}
   }
 
   function createVisibleChallenge(challenge) {
-    if (challenge.superBlock.toLowerCase() === 'certificates') return;
     createNode(createChallengeNode(challenge, reporter));
   }