Exposes _data/team.yml as publicly accessible JSON

I'm not sure if this will actually work (it should but my localhost webrick server was serving the generated file with `Content-Type: text/html` instead of `application/JSON`) but this would expose the team member data we have in `_data` as an api endpoint and allow us to access it in any of our other projects (like dashboard) as well as in javascript on the front end.

Leaving this here for discussion.