zenith: 0.8.0 -> 0.8.1

[bbigras]

Motivation for this change

0.8.1 has support for the htop's "p mode"  @evils-devils . It behaves almost exactly but for some reason I see things like "Web Content" instead of the "firefox" process. bvaisvil/zenith#15

Things done

I removed platforms.x86 temporary just to see if it builds for aarch64 this time and if not so I can report the exact error message upstream at bvaisvil/zenith#19

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• 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 nixpkgs-review --run "nixpkgs-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)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

/nix/store/cj484xb1pqp8k7fs2p68lilfn0zgyyb7-zenith-0.8.0 34.8M
/nix/store/q2p6ylffsvpvqxf5p648nj7s3b4zw5f6-zenith-0.8.1 34.8M