If the sidebar is removed, it would be nice if whatever is left is centered on the page....
A PmWiki skin using Bootstrap and Compass stylesheets.
Works out of the box. Download it, update local/config.php to use $Skin = 'bootstrap-fluid';
You are viewing the default Bootstrap theme.
Github Repo git clone https://github.com/MichaelPaulukonis/pmwiki-bootstrap-skin
The basic editing page describes how to create pages in PmWiki. You can practice editing in the wiki sandbox.