Move Ilan and Samson to alumni (#425)

* move Ilan to alumni

* move Samson to alumni

_members/ilan-gold.md

@@ -6,12 +6,12 @@ photo: ilan-gold.jpg
 alt: Photo of a smiling young man with dark brown hair who appears to be white. He has brown eyes and stubble, and is standing in front of a door.
 
 job_title: Software Developer
-role: staff
+role: alumni
 
 services:
   github: https://github.com/ilan-gold
 
 start: August 2019
-end:
+end: April 2024
 ---
 Ilan Gold is a software engineer with a B.A in Mathematics from the University of Pennsylvania. He is currently developing Viv and also contributes to Vitessce.  He enjoys learning new things and listening to music in his free time.

_members/samson-toor.md

@@ -6,14 +6,14 @@ photo: samson-toor.jpg # this file is relative to `assets/img/members/`
 alt: Headshot of an adult brown man with short black hair, a neatly trimmed full beard, and large, gold rimmed browline eyeglasses wearing a black button-up. He is situated in front of a blurred outdoor setting.
 
 job_title: Senior UI/UX Designer
-role: staff
+role: alumni
 
 services:
   github: https://github.com/samson89
   linked-in: https://www.linkedin.com/in/samson-
 
 start: October 2023
-end:
+end: June 2024
 ---
 Samson Toor is a Senior UI/UX Designer in the Department of Biomedical Informatics at Harvard Medical School. 
 He received his B.S. in Cognitive Science with specialization in Human Computer Interaction from the University of California, San Diego.