colorschemes/onedark: migrate to by-name

plugins/colorschemes/onedark.nix

@@ -1,42 +0,0 @@
-{
-  lib,
-  ...
-}:
-lib.nixvim.plugins.mkNeovimPlugin {
-  name = "onedark";
-  isColorscheme = true;
-  package = "onedark-nvim";
-
-  maintainers = [ lib.maintainers.GaetanLepage ];
-
-  settingsExample = {
-    colors = {
-      bright_orange = "#ff8800";
-      green = "#00ffaa";
-    };
-    highlights = {
-      "@keyword".fg = "$green";
-      "@string" = {
-        fg = "$bright_orange";
-        bg = "#00ff00";
-        fmt = "bold";
-      };
-      "@function" = {
-        fg = "#0000ff";
-        sp = "$cyan";
-        fmt = "underline,italic";
-      };
-      "@function.builtin".fg = "#0059ff";
-    };
-  };
-
-  callSetup = false;
-  colorscheme = null;
-  extraConfig = cfg: {
-    colorschemes.onedark.luaConfig.content = ''
-      _onedark = require('onedark')
-      _onedark.setup(${lib.nixvim.toLuaObject cfg.settings})
-      _onedark.load()
-    '';
-  };
-}

plugins/default.nix

@@ -2,7 +2,6 @@
   imports = [
     ./cmp
 
-    ./colorschemes/onedark.nix
     ./colorschemes/oxocarbon.nix
     ./colorschemes/palette.nix
     ./colorschemes/poimandres.nix