Impress 2020 is deployed to a VPS server. We use this Ansible Playbook to
automate the environment setup!

We expect to be deploying to Ubuntu 20.04 LTS, initially with nothing
installed. The user you deploy with should have sudoers access. That should be
all it takes!

First, run `yarn deploy-setup` in the app root, to run the `setup.yml`
playbook. This will prompt you for your root password, to set up system
dependencies. It should be safe to re-run this, including if you add a new
dependency to the playbook, because the steps are non-destructive and Ansible
will skip steps that are already satisfied.

Then, to deploy a new version of the app, run `yarn deploy`. This will build
the app from the code on your machine, then send the source and build output
to the remote machine, and switch it to be the new production version. Nice!