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.

[elijahbenizzy]

Looks good, two points:

1. We should make it more clear why we're showing this example (the other examples are (a) something they'll want to do or (b) something they'll recognize, this is something that is just for fun, but teaches something interesting
2. We should clarify when we use the Hamilton integration and when we don't, two different paths is going to confuse people.