First release planning

[jcallaham]

What do we think would be the key features to have in place before releasing to the public/writing an initial paper?

Some things that have already been brought up:

• [x] Fully validated cylinder, pinball, cavity, and backwards-facing step configurations.
• [ ] Baselines from classical control (LQR and PID, for instance)
• [x] HPC workflow for RL with basic built-in optimizers (PPO)
• [x] Test suite
• [x] Documentation and examples