ocropus: remove

[armeenm]

Description of changes

Ocropus doesn't support python3 and hasn't seen much activity lately, so it's unlikely it will anytime soon.
NB: The pkgs/top-level/aliases.nix has some noise because I sorted the "O" section.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.05 Release Notes (or backporting 21.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[Mindavi]

cc @domenkozar who's maintainer

[davidak]

Generally looks good

Needs rebase

[Mindavi]

I think something went wrong during rebase since there seem to be unrelated changes in the aliases file

[armeenm]

Yep, should be good now.
(The whole "O" aliases section needs a sort, fyi)

[Mindavi]

Probably better to do that when there's less churn :)