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Short and sweet. But full disclaimer, because my digital ocean subscription lapsed by the time I got to this, I didn't actually run the commands.
The whole deployment side of things is a bit tricky compared to the rest of the book because it relies so heavily on what service a given company happens to be offering at a given time. I suspect most readers will want to make use of free hosting (or just skip the whole thing). So perhaps it is worth thinking about how the deployment aspects could all be brought together into a single run of chapters - or at least communicate to the reader which chapters they might need to be paying for a service to work their way through.