我有这个网站，我的 css 和 javascript 链接可以正常工作，但问题是 css 没有应用到网站上。当我访问我的 css 的链接时，浏览器也会下载 css 和 javascript 文件。我试过谷歌的 PageSpeed Insights，它说
消除首屏内容中的外部渲染阻止 Javascript 和 CSS
因此，我的样式表无法正常工作。
Resource interpreted as Stylesheet but transferred with MIME type application/x-httpd-php
这是我网站的文件结构。我在我的网站上使用 Smarty 模板和 Bootstrap。
我的模板在视图文件夹中
示例代码
索引.php
<?php
require_once('includes/initialize.php');
$smarty = new Smarty_skyerp();
//$smarty->testInstall();
$smarty->assign('title','Skyerp | Home');
$smarty->assign('year',date("Y", time()));
$smarty->display('index.tpl.html');
?>
index.tpl.html
{extends file='layout.tpl.html'}
{block name='nav'}
<ul class="nav">
<li class="active"><a href="index.php">Home</a></li>
<li><a href="skyerp.php">SkyERP</a></li>
<li><a href="payroll.php">SkyPayroll</a></li>
<li><a href="manual.php">Manuals</a></li>
<li><a href="support.php">Support</a></li>
<li><a href="about.php">About Us</a></li>
<li><a href="contact.php">Contact Us</a></li>
</ul>
{/block}
{block name='content'}
<div class="row-fluid"></div>
{/block}
布局.tpl.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>{$title}</title>
<link href="assets/css/bootstrap.css" type="text/css" rel="stylesheet">
<link href="assets/css/bootstrap-responsive.min.css" type="text/css" rel="stylesheet">
<link href="assets/css/docs.css" type="text/css" rel="stylesheet">
<style type="text/css">
body {
<!--background-image: url('assets/img/skyerp_blue.jpg');-->
background-size: 80%;
background-repeat:no-repeat;
background-attachment:fixed;
background-position:bottom;
}
</style>
<link href="assets/css/stickyfooter.css" rel="stylesheet">
<script type="text/javascript" src="assets/js/jquery.js"></script>
{block name="head"}{/block}
</head>
<body data-spy="scroll" data-target=".module-sidebar">
<div id="wrap" style="height: 100%;">
<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<button type="button" class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="brand" href="index.php" style="padding: 6px 10px 1px 0;"><img src="assets/img/headerfull.png"/></a>
<div class="nav-collapse collapse" style="margin-top: 14px;">
{block name='nav'}{/block}
<!--<form class="navbar-form pull-right">
<input class="span2" type="text" placeholder="Email">
<input class="span2" type="password" placeholder="Password">
<button type="submit" class="btn btn-primary">Sign in</button>
</form>-->
</div>
</div>
</div>
</div>
<div class="container">
{block name='banner'}{/block}
{block name='content'}{/block}
</div>
<div id="push"></div>
</div>
<footer id="footer" class="footer">
<div class="container">
<p>SkyErp © {$year}. All Rights Reserved.</p>
<p></p>
<p></p>
<ul class="footer-links">
<li><a href="http://blog.getbootstrap.com">Blog</a></li>
<li class="muted">·</li>
<li><a href="https://github.com/twitter/bootstrap/issues?state=open">Issues</a></li>
<li class="muted">·</li>
<li><a href="https://github.com/twitter/bootstrap/blob/master/CHANGELOG.md">Changelog</a></li>
</ul>
</div>
</footer>
<script src="assets/js/bootstrap.min.js"></script>
{block name='script'}{/block}
</body>
`
问题的原因是什么？是服务器端的问题还是我如何处理我的文件？我应该怎么做才能解决这个问题？