Ethical stack diagram

[CoralineAda]

What does this PR accomplish?

• Adds an illustration of the Ethical Stack concept

Getting there

• The diagrams were created in OmniGraffle.

Interesting bits

• I have additional versions of the diagrams for use in documents.

Notes for reviewers

• Diagram appears on this page from the preview site: https://deploy-preview-139--ethicalsource.netlify.app/what-we-do/
• Open to any kind of feedback!

[netlify[bot]]

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