chore: operator tutorial (#532)

## Description

Pepr Operator Tutorial for docs. Accompanies Excellent Example for
Operator.
https://github.com/defenseunicorns/pepr-excellent-examples/tree/main/pepr-operator

## Related Issue

Fixes #509 
<!-- or -->
Relates to #

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [x] Other (security config, docs update, etc)

## Checklist before merging

- [x] Test, docs, adr added or updated as needed
- [x] [Contributor Guide
Steps](https://github.com/defenseunicorns/pepr/blob/main/CONTRIBUTING.md#submitting-a-pull-request)
followed

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Signed-off-by: Case Wylie <cmwylie19@defenseunicorns.com>