adding Davis Townsend to the team.yml

@davis_townsend, I'm not sure that you have a twitter handle (or if you want it added to the org page). This addresses Day 4's:

New team member: Update your slug, full name, photo, social media handles and story on the team page by following the instructions in the handbook, or follow this video: Adding Self to GitLab Team Page. Please make sure to include your nickname when you do so if you prefer to be called anything other than your first name. You can always reach out to your buddy, manager, or anyone in the company if you get stuck!

in gitlab-com/people-ops/employment#1330.