clan-cli: symlink cli into an otherwise empty package

This avoids propagating unneeded python libraries

pkgs/clan-cli/default.nix

@@ -146,11 +146,6 @@ python3.pkgs.buildPythonApplication {
     installShellCompletion --fish --name clan.fish \
       <(${argcomplete}/bin/register-python-argcomplete --shell fish clan)
   '';
-  # Don't leak python packages into a devshell.
-  # It can be very confusing if you `nix run` than than load the cli from the devshell instead.
-  postFixup = ''
-    rm $out/nix-support/propagated-build-inputs
-  '';
   checkPhase = ''
     PYTHONPATH= $out/bin/clan --help
     if grep --include \*.py -Rq "breakpoint()" $out; then