I see what happened. The link to my entry in the winner's list was a link
to my entry within the standard-fish/summer-competititon-2019 repository.
So when I thought I was forking/cloning my entry I was actually
forking/cloning the entire competition. I could delete and rename
everything but my entry, but then if anyone were to merge it back the entire
competition results would disappear.
So I'll have to make a new repository from scratch. That will have to wait
until I have some time free.
-- hendrik.