Remove irrelevant files from the repo

Thanks for your contribution!

As the project is not a sandbox but a full project, please take a few steps towards adhering to Drupal's guidelines.

Please remove files/folders from the module repo that should not be there. In this case

• .docksal
• LICENSE.txt
• phpunit.xml
• phpunit.xml.dist
• runner.yml.dist

For testing on drupal.org you can set up gitlab CI/drupal CI - see example here. The license is added by the Drupal packager and should not be manually defined. Docksal should be irrelvant for drupal modules as it's usually used to containerize the whole Drupal instance.