colorschemes/nord: migrate to by-name

plugins/colorschemes/nord.nix

@@ -1,51 +0,0 @@
-{
-  lib,
-  ...
-}:
-let
-  inherit (lib.nixvim) defaultNullOpts;
-in
-lib.nixvim.plugins.mkVimPlugin {
-  name = "nord";
-  isColorscheme = true;
-  package = "nord-nvim";
-  globalPrefix = "nord_";
-
-  maintainers = [ lib.maintainers.GaetanLepage ];
-
-  settingsOptions = {
-    contrast = defaultNullOpts.mkBool false ''
-      Make sidebars and popup menus like nvim-tree and telescope have a different background.
-    '';
-
-    borders = defaultNullOpts.mkBool false ''
-      Enable the border between vertically split windows.
-    '';
-
-    disable_background = defaultNullOpts.mkBool false ''
-      Disable the setting of background color so that NeoVim can use your terminal background.
-    '';
-
-    cursorline_transparent = defaultNullOpts.mkBool false ''
-      Set the cursorline transparent/visible.
-    '';
-
-    enable_sidebar_background = defaultNullOpts.mkBool false ''
-      Re-enables the background of the sidebar if you disabled the background of everything.
-    '';
-
-    italic = defaultNullOpts.mkBool true ''
-      Enables/disables italics.
-    '';
-
-    uniform_diff_background = defaultNullOpts.mkBool false ''
-      Enables/disables colorful backgrounds when used in _diff_ mode.
-    '';
-  };
-
-  settingsExample = {
-    borders = true;
-    disable_background = true;
-    italic = false;
-  };
-}

plugins/default.nix

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