Requirements

• A fresh Drupal 8 installation
• If you use satellite sites deployment through the backoffice, web server user must have write permissions on sites directory

Installation

Install Drupal as usual, download webfactory package.
In the webfactory module, you'll find a script install-site.php, copy it next to index.php. If you don't use site deployment, you can avoid this step.

Enable webfactory_master module :
drush dl webfactory && drush en webfactory_master