Fedora COPR repo is marked unmaintained

[danila-zol]

The COPR repo recommended in the README is stated to be no longer maintained by the author in the repo description with most builds failing. It should probably be replaced by another one and no longer be recommended.

[jesseduffield]

Would you be open to raising a PR to remove that from the readme @danila-zol ?

[danila-zol]

@jesseduffield Yes, opened #4362