Yes. That is the right way to go as a mention and credit. But it would be wise to add unless they are active for us, then mention such, else as a historical approach and us carrying it forward.
Not necessarily to do that. Good to have, but not necessary.
This too is not necessary if @alaskalinuxuser is going to do everything there, or unless you are going to contribute there directly. Any extra accounts just are burdens tbvh.
For the rest, let me know when ready for things, and I will open my site for others with our files.
I have kept them, only excluded from daily backups for my server. 