zsh: use built-in `time`, and enable (uncomment) nix
[~bandali/configs] / x /
drwxr-xr-x   ..
-rw-r--r-- 133 .Xresources
drwxr-xr-x - .Xresources.d
drwxr-xr-x - .local
-rw-r--r-- 385 .xprofile