Без Sencha Cmd как-то так:
<head>
<title>Hello World</title>
<link rel="stylesheet" type="text/css" href="ext/packages/ext-theme-neptune/build/resources/ext-theme-neptune-all.css">
<script type="text/javascript" src="ext/build/ext-all-debug.js"></script>
<script type="text/javascript" src="ext/packages/ext-theme-neptune/build/ext-theme-neptune.js"></script>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
</head>
документация