feat: 🎸 add sam image to about

[paulstey]

BREAKING CHANGE: 🧨 no

This is a tiny PR to add an actual headshot for Sam to the about page.

Check the types of changes present in this PR:

• [ ] :bug: Bug
• [ ] :dragon: Feature
• [x] :frog: Data (data folder - people/opportunities)
• [ ] :dog: Content (content folder)
• [ ] :blowfish: Other. Specify:

Checklist:

• [x] Commitizen was used for all commits.
• [x] Local site looks as expected after changes.
• [x] Contributing guidelines were followed.
• [x] If changes affect development, was the README updated?

If PR to production

• [ ] Development site (https://datasci.brown.edu) was checked and looks as expected.

[github-actions[bot]]

Technical Reviewer Checklist

Make sure the updates follow the contribution guidelines and the code is clear. Some of the things you should check:

• [ ] All commits use conventional style
• [ ] Website builds
• [ ] Code is readable and easily understandable, with comments, but not commented out code
• [ ] Spacing and indentation is constistent
• [ ] README was updated (if needed) and update is comprehensive and useful
• [ ] No extraneous files added, especially a .env or similar