Updates telephone example

[skrawcz]

To make it a top-level example.

Simplifies it a little and splits out the two implementations to make the code simpler to look at.

Adds an example hook to save images locally.

Changes

• examples folder for image-telephone

How I tested this

• locally

Notes

• we can have the blog post link to the simple example here too.

Checklist

• [ ] PR has an informative and human-readable title (this will be pulled into the release notes)
• [ ] Changes are limited to a single goal (no scope creep)
• [ ] Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• [ ] Any change in functionality is tested
• [ ] New functions are documented (with a description, list of inputs, and expected output)
• [ ] Placeholder code is flagged / future TODOs are captured in comments
• [ ] Project documentation has been updated if adding/changing functionality.