Problem/Motivation
Contributing to this project is very different from a normal Drupal project, since it includes core. I tried cloning the project to my local, adding ddev, and then using composer to install dependencies. The result is a site that displays a 403 error. I also tried adding drush but running drush site:install also resulted in a string of errors.
Proposed resolution
Provide a documentation page with the steps required to git clone the repo locally and then create a functioning Drupal site in ddev, for the purposes of contribution.