ad7ag.md: add personal_page field

- Added a personal_page entry pointing to https://alejandrodlpc.github.io/ in the graduate student profile.

Signed-off-by: Leonid Petrov <[email protected]>

Author: lenis2000

_departmentpeople/gradstudents/ad7ag.md

@@ -7,7 +7,8 @@ position: Graduate Student
 office: 121 Kerchof Hall
 phone: 434-982-2785
 email: [email protected]
-image: __SITE_URL__/img/people/2021-fall/Castano_A.jpg 
+image: __SITE_URL__/img/people/2021-fall/Castano_A.jpg
+personal_page: https://alejandrodlpc.github.io/