Creates a sitemap.xml file for the HTML files inside a Beetle output directory.
In order to use this plugin, you first have to add beetle_sitemap to the list of plugins in your Beetle config.yaml file and add a site setting for the plugin. site should be set to the full root of where the site will be accessible at, including the protocol, ie: site: http://tenzer.dk.
When that's done you can run beetle sitemap to generate a sitemap.xml file of the HTML files in the output directory, so you should have ran beetle render first. You can also run them directly after each other if you run beetle render sitemap.