Improving Simplytest's maintainability

Things have been pretty quiet on the Simplytest front. But I want to bring a fresh round of changes that will make it an easier project to maintain. The Simplytest development workflowIn 2021, I spent time helping Adam Bergstein complete the project's modernization off of Drupal 7. We migrated the code from a self-managed virtual server owned by Adam to sponsored hosting by amazee.io on Lagoon.