[ATL-2025] Nathen no longer uses Twitter

Signed-off-by: Nathen Harvey <nathenharvey@google.com>

Author: nathenharvey

content/events/2025-atlanta/speakers/nathen-harvey.md

@@ -2,7 +2,6 @@
 Title = "Nathen Harvey"
 Linkedin = "https://www.linkedin.com/in/nathen/"
 Website = "https://linktr.ee/nathenharvey"
-Twitter = "nathenharvey"
 image = "nathen-harvey.png"
 type = "speaker"
 linktitle = "nathen-harvey"