I believe that if the president is incapacitated in any way the Vice President becomes Acting President. I guess they could stay in that role until the end of the term but if expect they’d use their new power in some fashion to make it more permanent.

I use the community maintained docker container from https://github.com/nextcloud/docker

It’s separate containers for all the services, if you scroll down the readme you’ll find the compose file they recommend to start you out.