app/views/layouts/application.html.erb
<!DOCTYPE html>
<html lang="en">
<head>
<title>DeskrockTestApp</title>
<%= #noinspection RailsParamDefResolve
stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>
<%= #noinspection RailsParamDefResolve
javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">Stock productivity calculator</a>
</div>
<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav">
<% unless current_page? pages_about_path %>
<li><a href="/pages/about">About</a></li>
<% end%>
</ul>
</div>
</nav>
<div class="container">
<%= yield %>
</div>
</body>
</html>