v56-b9457d8

b9457d8 README- add docker to deployment section (Meghan)

42054f4 circleci- update docker orb and push to latest tag (Meghan)

5a262f8 add docker-compose file to test --base usage (Meghan)

b262fcc fixes #80 (Meghan)

8100e05 allow themes to be read from env (Meghan)