Update to people page

[samgdotson]

Summary of changes

This PR

• updates the People and Alumni pages of the group website.
• updates photo and information for Sam Dotson

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] I have read the CONTRIBUTING document.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

Associated Issues and PRs

• Issue: #

Associated Developers

• Dev: @

Checklist for Reviewers

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