Improve getting started for npm and framework pathways

[brettfiedler]

We noted the need for "Documentation with a straightforward “entry point” and minimal “get started with an example” code. Better visual examples (or a directory) for sun components. Better high-level docs for how things fit together."

Currently "Missing axon/model/property tutorials, and how to handle more complex input patterns"

JO has created https://github.com/scenerystack/demo-examples with some simple examples using the NPM package.