Add Mike Greiling (and his pet) to Team Page

Filling out my team page profile and adding my Chihuahua Milo to the pets page :)

As requested in the onboarding checklist here's the tweet template for @amara:

Very happy to announce that Mike Greiling has joined our #frontend team! Welcome @mikegreiling! https://about.gitlab.com/team/

/cc @jschatz1