Remove inactive Slack users

This is a project related to our proposed collaboration platforms confidentiality practices.

Basically we have some inactive users who are not part of the YPC team that I think need to be removed.

Here’s an example from MANYC that we could learn from

https://docs.google.com/document/d/1u3UnGDBECirM5LpFwyj4QPGW_450YJ6fJ6SUttrsR-I/edit

What do you all think?