Distinguishing between minimal and robust deployments

This project was initially set up to prioritize the smallest, cheapest configuration that would give you a working app. The motivation was setting up a low-spec deployment for people making their first deployment, or experienced people trying out a new platform.

That's not the main use case anymore. It's still important, but we also want to serve people well who are looking to make a robust initial deployment. That means enough memory to serve a moderate level of traffic well, a managed postgres instance, and maybe a few more resources.

Tasks
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- [ ] Write specs for robust deployment.
- [ ] Figure out CLI options to enable this.
- [ ] Implement
- [ ] Document
- [ ] Merge
- [ ] Announce