Brigade model is uuuuuuugly and needs to be cleaned

[therebelrobot]

When taking inventory for brigadehub/theme-admin-c4sf#4, the underlying data model has been ducttaped together, with duplicate info and info that should never be in there. This needs to be refactored to better reflect the data that is specific to the brigade alone, namespaced and cordoned off for different uses (theme settings, auth settings, general info, etc.)