Replace our own variables and customizations with the supplied opsfiles

[bengerman13]

In order to simplify deployment config and ensure we're configuring things as supported by the upstream, we should refactor this release to replace our own variables, custom deployment manifest, and opsfiles with the built-in manifest and opsfiles wherever possible.
We might even be able to get rid of the oauth proxy?

---

Security considerations

Messing with our alerting system is always a risk for visibility, but the should result in a more robust system in the end.