Adds missing people files

[ahaywood]

Add Missing External Collaborators

This PR adds 15 external collaborators who were previously referenced in publications but didn't have profile pages, plus updates the README with comprehensive documentation for content structure.

Changes

Added External People Profiles:

• Bruce M. Maggs
• Darrell D. E. Long
• Devashish R. Purandare
• Devon O'Brien
• Ethan L. Miller
• Hossam S. Hassanein
• J. Alex Halderman
• João Diogo Duarte
• Marek Vavruša
• Nigel P. Smart
• Pratik Soni
• Riad S. Wahby
• Sharief M. A. Oteafy
• Sofía Celis
• Tancrede Lepoint

Documentation Updates:

• Added comprehensive frontmatter templates for People, Publications, and Presentations
• Documented status field values: "current" | "inactive"
• Documented type field values: "active" | "alumni" | "external" | "intern" | "inactive"
• Documented pillar field values: "fast" | "private" | "safe" | "reliable" | "measurable"
• Added notes about avatar storage location and team page display rules

Notes

• All new external collaborators use placeholder.png as avatar and are marked as type: external with status: inactive
• Only active and alumni types are displayed on the team page

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
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