add spoiler tag to babycode

data/static/js/babycode-editor.js

@@ -173,5 +173,8 @@
       const json_resp = await req.json();
       previewContainer.innerHTML = json_resp.html;
       previewErrorsContainer.textContent = "";
+
+      const accordionRefreshEvt = new CustomEvent("refresh_accordions");
+      document.body.dispatchEvent(accordionRefreshEvt);
   });
 }