Problem binding to port 80: Could not bind to IPv4 or IPv6 with certbot
The docker-proxy is the user space port forwarding process used by docker when you publish a container's port. Run a docker container ls to show all running containers, along with the ports each may be publishing, and stop the container listening on the ports you want to use.
This error means you have a web server running on the port on which Certbot is attempting to renew your ssl cert. Figure out what's running and stop that process. Keep in mind you may have port forwarding rules on your host.