Cleaned up and simplified all docker files to remove all commented-out lines (now that they are in VC). Removed obsolete files. Cleaned up the readme.txt to make all the specific steps clearer and to remove excess chatty language.
Created a docker-compose script with 2 containers, one for the app/web, and one for the db. This will in the future ideally be split into 3, one each for app/db/web, but baby steps. Committing before I accidentally break it again.
