Switch demo gallery iframe URL to hugging face spaces (#697)

Author: wwwillchen

docs/javascript/demo.js

@@ -2,6 +2,6 @@ const urlParams = new URLSearchParams(window.location.search);
 const demoParam = urlParams.get('demo') || '';
 
 const iframe = document.createElement('iframe');
-iframe.src = 'https://mesop-tdcukehw6q-uc.a.run.app/' + demoParam;
+iframe.src = 'https://wwwillchen-mesop.hf.space/' + demoParam;
 iframe.className = 'full-screen-iframe';
 document.body.appendChild(iframe);