[Intro] Add dinosaur illustration to code of ethics

[ehumph]

Because we thought the image of a dinosaur with an angel and a devil on its shoulders would be cute.

[ehumph]

Resolves #54

[github-actions[bot]]

No spelling errors! :tada: Comment updated at 2023-07-12 with changes from 70b9367ff6386b099085d995795cf9961413ea3b

[github-actions[bot]]

No broken urls! :tada: Comment updated at 2023-07-12 with changes from 70b9367ff6386b099085d995795cf9961413ea3b

[github-actions[bot]]

Re-rendered previews from the latest commit:

• See preview of Bookdown here
• See preview of Coursera/Leanpub version here
• Download the preview of .docx file

Updated at 2023-07-12 with changes from 70b9367ff6386b099085d995795cf9961413ea3b

[avahoffman]

Love it so much 🤩