Developing using Docker is now simple and avoids the need to install PHP on the developer's host machine. Common code from `dev.sh` and `dev-docker.sh` has been extracted into a `dev-prepare.sh`. README contains instructions on how to use both dev scripts - which the developer can choose based on their preference.
Provide an example configuration which is automatically made as the default configuration if no other configuration is provided. This makes starting the server for development as per the instructions in the README simpler and works without any additional actions. Without this, there is no config file and the site will not be served.
