Tune uWSGI settings based on application profile

[rhysyngsun]

See my writeup on how to approach this: https://github.com/mitodl/hq/discussions/393

The current settings on xPro (workers = 3, threads = 25) is probably a good starting point for values.

NOTE: MicroMasters is an older application, it's probably going to be more difficult to do this work, so I would recommend not spending a lot of time fine-tuning the settings and instead apply some reasonable settings, monitor on newrelic, and tune further if needed.