BastionBytes integration for BookStack

The intention of this plugin is to let non-technical users edit parts of your WordPress page in BookStack.
Changes in BookStack will be displayed on your website.

When a BookStack user changes content on a BookStack site a REST request is sent to https://yoursite/wp-json/bookstack/v1/site-update to
Wordpress that the site has changed. The next time a WordPress page containing a shortcode to the previously changed BookStack site is requested,
the plugin will make a request to BookStack to fetch the new content. In normal operation the content is cached.