nixvim/plugins/smart-splits: remove

It has been upstreamed in NixVim so that's a-go-go.

modules/nixvim/default.nix

@@ -6,6 +6,5 @@
     ./plugins/lush-nvim.nix
     ./plugins/legendary-nvim.nix
     ./plugins/nvim-config-local.nix
-    ./plugins/smart-splits.nix
   ];
 }

modules/nixvim/plugins/smart-splits.nix

@@ -1,37 +0,0 @@
-{ config, lib, pkgs, helpers, ... }:
-
-let
-  cfg = config.plugins.smart-splits;
-in
-{
-  options.plugins.smart-splits = {
-    enable = lib.mkEnableOption "smart-splits.nvim";
-
-    package = helpers.mkPackageOption "smart-splits.nvim" pkgs.vimPlugins.smart-splits-nvim;
-
-    settings = lib.mkOption {
-      type = with lib.types; attrsOf anything;
-      default = { };
-      description = ''
-        Configuration to be passed as argument to `setup` function of the
-        plugin.
-      '';
-      example = {
-        resize_mode = {
-          quit_key = "<ESC>";
-          resize_keys = [ "h" "j" "k" "l" ];
-          silent = true;
-        };
-        ignored_events = [ "BufEnter" "WinEnter" ];
-      };
-    };
-  };
-
-  config = lib.mkIf cfg.enable {
-    extraPlugins = [ cfg.package ];
-
-    extraConfigLua = ''
-      require('smart-splits').setup(${helpers.toLuaObject cfg.settings})
-    '';
-  };
-}