Use monaco editor in demo

packages/artplayer-document/src/script/bugfix.js

@@ -5,7 +5,7 @@ document.addEventListener('click', (event) => {
         if (codeElement) {
             const libs = event.target.dataset.libs || '';
             const code = encodeURIComponent(codeElement.innerText);
-            const env = window.location.host.includes('localhost') ? 'http://localhost:8081' : 'https://artplayer.org';
+            const env = window.location.host.includes('localhost') ? 'http://localhost:8080' : 'https://artplayer.org';
             const url = env + '/?libs=' + libs + '&code=' + code;
             window.open(url);
         }