Simplify `hello-pepr.ts` and provide external repo for examples

[cmwylie19]

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

hello-pepr.ts and hello-pepr.samples.json have gotten too big.

Describe the solution you'd like

• Given someone runs npx pepr init
• When the repo is generated
• Then there is a slimmed down version of hello-pepr.ts with only one fluent api example and only one of each mutate/validate/watch. Also, there is an external repo called pepr-examples with the current hello-pepr.ts examples.

Relates to: #288

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Additional context

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