Changes the team data from json format to yml

In order to make onboarding the widest range of talent into the brigade as easy as possible, the experience as to be simple. The JSON format looked intimidating for new or non technical members. I want to try using YML to see if its easier for regular people to add themselves in a browser based pull-request workflow. If it's terrible we can switch it back.
Forgot to remove the old JSON file
Merge pull request #26 from scottelundgren/convert-json-to-yml

Convert json to yml