examples: TodoMVC link is broken

[srid]

The link in the README of https://github.com/hercules-ci/arion/tree/master/examples/todomvc doesn't go anywhere.

It links to https://github.com/nix-community/todomvc-nix/tree/master/deploy/arion but that is 404.

[roberth]

It was added here https://github.com/nix-community/todomvc-nix/pull/4 but removed when the project was converted to center around a flake. I suppose it could be reintroduced by importing the flake. I don't know if that project prefers flake-compat or the experimental flakes feature flag.