[ANNOUNCE] expiration of knop-project.org and hosting of demo

I am not going to renew the domain `knop-project.org`. If you would like to take it over, I will approve a transfer to you. It expires on 2021-05-31.

Additionally Anu Internet services hosts the Knop demo at https://knop-project.org/ for no cost as a non-profit. I would hand over the reigns to any willing volunteer.