Clean up _data/members.json

[ErikBoesen]

You can allow omission of certain properties (like imagepath and label) and fallback to reasonable defaults in templating. Additionally I don't see why you need to have an object with the single key members—the whole file can just be the array of members, and that way you don't have to subscript into site.data.members.members, you can just do site.data.members.

[ErikBoesen]

You also might want to consider using YAML since it's a lot cleaner

[ErikBoesen]

Alternatively, if you want to keep the members key there, you might also want to add another section of the file for the three leaders at the top, who are currently hardcoded