Create About Team page

To get this to work:
- [ ] Change `people.json` to be included in Mustache template data by reading it in `Gruntfile.js` and setting `globals` to it
- [ ] Get people to fill in missing content
- [ ] Figure out where we want this - as a new page, but linked to in the footer? as a button to switch the footer to show the info there? as a button to show the info in the main page header?
