@Danilo,
Aqui nesse link explica como fazer:
https://style.fluig.com/javascript.html#collapse
Pelo que vi no seu HEAD, ele está assim:
<head>
<title></title>
<link href="/portal/resources/style-guide/css/fluig-style-guide.min.css" rel="stylesheet" type="text/css" />
</head>
O correto é assim:
<head>
<link type="text/css" rel="stylesheet" href="/portal/resources/style-guide/css/fluig-style-guide.min.css"/>
<script type="text/javascript" src="/portal/resources/js/jquery/jquery.js"></script>
<script type="text/javascript" src="/portal/resources/js/jquery/jquery-ui.min.js"></script>
<script type="text/javascript" src="/portal/resources/js/mustache/mustache-min.js"></script>
<script type="text/javascript" src="/portal/resources/style-guide/js/fluig-style-guide.min.js" charset="utf-8"></script>
</head>
Copie todo esse código e coloque lá:
<html>
<head>
<link type="text/css" rel="stylesheet" href="/portal/resources/style-guide/css/fluig-style-guide.min.css"/>
<script type="text/javascript" src="/portal/resources/js/jquery/jquery.js"></script>
<script type="text/javascript" src="/portal/resources/js/jquery/jquery-ui.min.js"></script>
<script type="text/javascript" src="/portal/resources/js/mustache/mustache-min.js"></script>
<script type="text/javascript" src="/portal/resources/style-guide/js/fluig-style-guide.min.js" charset="utf-8"></script>
</head>
<body>
<div class="fluig-style-guide">
<form name="form" role="form">
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a class="collapse-icon up" data-toggle="collapse" data-parent="#accordion" href="#collapseOne">
Collapsible Group Item #1
</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse in">
<div class="panel-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a class="collapse-icon" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">
Collapsible Group Item #2
</a>
</h4>
</div>
<div id="collapseTwo" class="panel-collapse collapse">
<div class="panel-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a class="collapse-icon" data-toggle="collapse" data-parent="#accordion" href="#collapseThree">
Collapsible Group Item #3
</a>
</h4>
</div>
<div id="collapseThree" class="panel-collapse collapse">
<div class="panel-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
</div>
<button type="button" class="btn btn-danger" data-toggle="collapse" data-target="#demo">
simple collapsible
</button>
<div id="demo" class="collapse in">
<h1>Apenas teste</h1>
<input type="text" name="txt_teste" id="txt_teste">
</div>
</form>
</div>
</body>
</html>