This backports from topic-docker the base image, which we can now use in
Circle to MASSIVELY speed up our CI situation.
The base image can currently only be pushed by @klardotsh as nobody else
has access to the Docker Hub org, but that can change in the future.
- Lock our vendored dependencies (also pull in some new ones I will be
needing soon)
- Ensure we have a sane way of pulling those vendored dependencies into
the DFU-flashable images (upy-freeze.txt)
- Break up the Makefile into a bunch of smaller, sometimes reusable
chunks
- Add a noop keyboard that simply exits, so we can flash a "keyboard"
that just dumps us straight to REPL
- Remove my personal ampy config since that's not portable at all
