[WIP] Update examples to use YAML policies instead of JSON

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update the examples to use YAML policies</issue_title>
<issue_description>Update the examples to use YAML policies instead of JSON policies, most particularly in the README.md file.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update the examples to use YAML policies #42

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