feat: added recursive delete to groups

feat: added login to people

Crud internship

feat: Added config support and auto-loading for multiple environments and added some trackig to internships

fix: PUT internships/studentId doesn't require a tracking body member anymore, and will correctly update. Changed save to make sure studentId is unique on insert. Custom error handling.

Changed groups format to use unique id and non-unique name

Get people

Crud groups

Changed findAll to use Promise and return actual group JSON object and not observer containing the object