Add outstanding README contents

[jasonmp85]

This is a work in progress, but pushing up for reference, for now.

This isn't intended for merge, but to share some of the changes I made and discussed last week with @EvanHStanton

[jasonmp85]

Most of these are somewhat necessary, but I found the telemetry stuff to get in the way of comprehension as a first-time reader.

[jasonmp85]

The linting stuff seems unrelated to a first-run experience. Maybe move into contributing, or further down the document.

[jasonmp85]

Frankly, I don't think the nightly stuff is needed at all any more; things seem to work just fine with the stable release tooling.

[jasonmp85]

After this is running, the kubectl apply command should be usable to just run a stack locally and connect with psql. This stuff comes literally last in this document. Most things between here and there seem to cover other use cases. They may be valuable, but as a first-time reader, I was mostly here for "I want to run locally". The next thing I would find interesting as a new dev is the cargo watch stuff, probably.