Replace hello-pepr.ts with pepr-excellent-examples repo + docs

[bdw617]

Is your feature request related to a problem? Please describe.

hello-pepr is great, but it's better as a test framework and a stream of examples.

Describe the solution you'd like

we should discuss in deeper what this should be, but it needs a lot of work.

Should include Prometheus example for scraping metrics with Grafana dashboard with PolicyReport