Enhancement/docker dev

[lidia-k]

Currently the development installation guide only explains about setting moto up in a virtual environment, not with Docker. There is already a dockerfile but with the current dockerfile, it requires a few more manual steps to complete running moto such as getting into a docker container, installing make, running a make command to install requirements, etc. I updated the dockerfile to implement the initial steps as a part of the docker build and created a new make command make docker-dev to build, run and volumize a docker container all in one command.

[lidia-k]

Thanks for the feedback @bblommers. As per your request, I included the new make command for docker as part of the CI and successfully tested it locally. I also updated the installation doc on how to use docker to set up a development server. Let me know if you have any other comments. Thank you.