JS: remove unnecessary link to `runtime.js` from archetype HTML
<head>
<title>Main page</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
- <script type="text/javascript" charset="utf-8" src="teavm/runtime.js"></script>
<script type="text/javascript" charset="utf-8" src="teavm/classes.js"></script>
</head>
<body onload="main()">
