content: update Dieu Lieu profile

[chengjiahao1234]

Type of Change

• ✅ Content Update (news, publications, team)

Summary

Updated Dieu Lieu's MSc student profile with his preferred display name, contact information, verified GitHub profile, and headshot.

Changes Made

• Updated the member name from "Tat Loai Dieu Lieu" to "Dieu Lieu" in _data/masters.yml
• Added Dieu Lieu's email and verified GitHub profile
• Added and connected the new images/teampic/dieu_lieu.png headshot

Testing Checklist

• Changes display correctly on desktop (1920x1080 or similar)
• Changes display correctly on tablet (768x1024 or similar)
• Changes display correctly on mobile (375x667 or similar)
• Tested in light theme
• Tested in dark theme
• No broken links or images
• No console errors
• Ran bundle exec jekyll serve locally without errors

Screenshots (if applicable)

Related Issues

None.

Additional Notes

• Verified all YAML data files parse successfully
• Ran git diff --check successfully
• Completed a clean Jekyll production build
• Confirmed /team/ and the new headshot return HTTP 200 locally
• Confirmed the rendered profile contains the correct name, photo, LinkedIn, GitHub, and email links
• No reliably matching personal website or Google Scholar profile was found

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By submitting this PR, I confirm:

• I have tested these changes locally
• I have followed the code standards in DEVELOPMENT.md
• I have updated documentation if needed
• I am ready for this to be reviewed and merged