Docker samples gallery?

Wonder if it would be valuable to have a simple docker build of this repo, and maybe as a follow-on to include it as a `--with-samples` option on the FireFly CLI.

Would mean a little restructure in terms of how we add new samples into the repo, as they'd need to become folders inside of one React App, rather than a set of separate react apps.

Obviously wouldn't really help for the CLI part (although it could too I guess, with a `docker run ...`)