ranger: add pillow dependency

[jlesquembre]

Pillow is required to preview images with kitty terminal
To test it, add these 2 lines to your rc.conf:

set preview_images true
set preview_images_method kitty

Motivation for this change

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

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[Ma27]

I'm sorry if I'm missing something, but image previews already work for me without your change in Kitty 0.11.3 and XTerm 335.

[jlesquembre]

Maybe you have only set preview_images true but not set preview_images_method kitty?
In that case, ranger uses w3m, that works for me too (more or less, some images are not properly displayed)
If you want to use kitty directly to preview the images, pillow is required:
https://github.com/ranger/ranger/blob/ffee23a4d92a6f71cd62a6c763b13163e1bfae4a/doc/ranger.pod#kitty

On my tests, kitty does a better job that w3m

[Ma27]

You're right, I just screwed the local ranger config up, sorry :D

[Ma27]

@jlesquembre thanks!