ref(logger): remove /app/bin/boot script

The use case for /app/bin/boot was to handle a bunch of tasks that
are better handled with systemd. Removing the reliance on bin/boot
follows The Docker Way.
I think this is an abuse of the `ExecStartPost` - a sidecar is the proper solution here. I would hold off on this change until we look at implementing a new init system wholistically.