[donc] Fix building the cubicweb js documentation
Avoids errors such as:
Exception: Bad file id cubicweb.lazy referenced in INDEX_IN_ORDER in ../../../doc/tools/pyjsrest.py, fix this please
<div id="ajaxroot">
<div class="ajaxHtmlHead">
<script src="http://foo.js" type="text/javascript"> </script>
<link rel="stylesheet" type="text/css" media="all" href="qunit.css" />
</div>
<h1>Hello</h1>
</div>