Update members list in docs: add new students and move alumni

[WPISabaGanji]

Motivation

• Reorganize the team listing to add newly joined students and correctly classify departed members as alumni.
• Correct or add profile images and emails for several entries and unify titles for student entries.

Description

• Updated docs/members.mdx to add several new student entries and update their imageUrl and title fields.
• Moved former PhD students (including Andrew J. Adiletta, Zhenyuan Liu, and Maryam Saadat Safa) into the alumni array.
• Removed duplicate/reordered entries in the phdStudents array and aligned image filenames/casing for new profiles.
• The change is limited to the members data file and does not modify rendering components.

Testing

• Ran the documentation site build with yarn build which completed successfully.
• Ran the linter with yarn lint which reported no errors.

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Codex Task