This simplifies the usage of the script by eliminating the need to
pass --server=$SERVER and --token=$TOKEN in each call to the script.
Also renames key=>token for consistency.
This script interfaces with a Zulip Botfarm - a flask server that wraps
docker and runs Zulip bots using the docker engine. This allows for
remotely hosting bots for better uptime, and reduces the configuration
steps needed for safely hosting a bot online.