chore(progress): update HTML file with embedded siblings

Author: kyojin

src/progress/index.html

@@ -1,3 +1,6 @@
+<link href="https://cdn.jsdelivr.net/gh/ulule/StreamElementsWidgets@main/src/progress/index.css" rel="stylesheet" />
+<script src='https://cdn.jsdelivr.net/gh/ulule/StreamElementsWidgets@main/src/progress/index.js' defer></script>
+
 <div class="amount"></div>
 <div class="progress-bar">
   <span class="progress-bar__content"></span>