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I'd like to suggest Overleaf again since it seems to be exactly what you need. If you don't want to pay for more than one collaborator, you can actually host it yourself. You can add users and administrators as you like (you can also add an SMTP server to allow sending email invitations to collaborators).
I had no idea either! Give this guide a shot. It's for their Overleaf Toolkit, which is designed to get up and running with minimal complexity. If you need any help, feel free to PM me. I'll do my best to help.