clear declarations

1-js/11-async/04-promise-error-handling/head.html

@@ -1,16 +1,4 @@
 <script>
-function loadScript(src) {
-  return new Promise(function(resolve, reject) {
-    let script = document.createElement('script');
-    script.src = src;
-
-    script.onload = () => resolve(script);
-    script.onerror = () => reject(new Error("Script load error: " + src));
-
-    document.head.append(script);
-  });
-}
-
 class HttpError extends Error {
   constructor(response) {
     super(`${response.status} for ${response.url}`);