Upgrade Mastodon to 2.0

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We need docker-compose to process.

Atomic and CentOS aren't really great for this use case: they lack Python and for Atomic it's an old Docker release.

So I guess what we should do is:

1. Prepare containers on a development Docker engine (keep Dwellers for that use?)
2. Publish them to a private registry
3. Pull them from the production Docker engine, and run them

Meanwhile, I recommend to keep using Dwellers until we've a working Docker container OS solution.