Go through process of distributing private bridges

Over at #31872 (moved), we created a process for distributing private bridges to NGOs: https://trac.torproject.org/projects/tor/wiki/org/teams/AntiCensorshipTeam/NGOBridgeSupport

It's now time to go through this process with a non-trivial number of censored users. Once we did, we need to document our experience and iteratively improve the process.