Implementation of a universal upload allowing for multiple storage backends
starting with `database` and `s3`.
Allows clients to put and retrieve files from either client or server using
a blend of client and server actions.
This change actually makes the authoring flow work for
the most part by tying in emailing and more.
We have also done a number of quality of life updates to
simplify the codebase overall making it easier to continue
work on the refresh.
Add support for production container builds using the provided `Dockerfile` and `build.sh` script. This can later be used with actions to automatically publish to the provided docker registry.
Additionally, support an accelerated developer quickstart using `docker-compose`. Developers can now run the `dx` npm command to quickly spin up a database and mail server.
