Update to team page Abby.yml

Very happy to announce that Abby Matthews joined our #peopleops team! Welcome @almhrs! https://about.gitlab.com/team/

cc @amara I tried to find the google sheet to add myself but for some reason it didn't show up when I searched. Also, I forgot to add my photo file link in the bio. Once this is merged I will need to go back in and add it I assume.