Document what images we have on DockerHub and why you would use it

[kweav]

At the bare minimum, I'd like the documentation to

• list what docker images we have on DockerHub
• does the docker image have multiple tags -- (which one should be used for what if so?)
• which dockerfile in this repo are associated with those images
• when was it last updated on DockerHub
• a small blurb on what you would use that image for

This documentation could include going through our repos in jhudsl and fhdsl and scraping the config files to say which repos use which images

If I automated it at all, maybe I could add a GitHub Action that would run whenever there was a successful manual build that pushed to docker hub and have it update the documentation with what it can from the build logs

[kweav]

Build a tree showing what is base for what?

[kweav]

Note that if someone builds it locally and pushes it to dockerhub, anything automated I'm trying to use for tracking won't work

[kweav]

Documentation in one big Contributing.md or each directory get a README?

"For information about each image, see description file in each directory".