update nathan's profile and direct people to Madicken

[nsryan2]

closes #268

Summary of changes

Updates Nathan's picture and information, and changes the open positions and you features on the website to email Madicken.

Types of changes

• [x] 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.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

Associated Issues and PRs

• Issue: #

Associated Developers

• Dev: @

Checklist for Reviewers

Reviewers should use this link to get to the Review Checklist before they begin their review.

[munkm]

Looks great! I'm happy to merge after the changes are made. Thank you so much for the updates!!!