update error.hbs to use proper GitHub URL

fivetanley doesn't own this project in GitHub anymore 😅

Author: fivetanley

app/templates/error.hbs

@@ -4,7 +4,7 @@
     <div class="whoops__message">
       <p>
         This page wasn't found. Please try the <LinkTo @route="index">API docs page</LinkTo>.
-        If you expected something else to be here, please file a <a href="https://github.com/fivetanley/ember-api-docs/issues/new" target="_blank" rel="noopener noreferrer">ticket</a>.
+        If you expected something else to be here, please file a <a href="https://github.com/ember-learn/ember-api-docs/issues/new" target="_blank" rel="noopener noreferrer">ticket</a>.
       </p>
     </div>
   {{else}}