About Wiki Page Layouts
From Help Wiki
This article references the Bootstrap 3.0 classes available for grid-based page layouts when using the default Evergreen MediaWiki skin (Chameleon).
Create a 2 Column Layout Help Wiki default article
Create a main content + sidebar layout
<div class="container-fluid">
<div class="row">
<div class="col-md-8 ">
<div class="lead">Lead text goes here
</div>
<!-- end col-md-8 -->
</div>
<div class="col-md-4 sidebar">
*[[sidebar links can go here]]
<!-- end col-md-4-->
</div>
<!-- end row -->
</div>
<!-- end container-->
</div>