Add vim-cool

Automatically disable `hlsearch` once a search is complete.

https://github.com/romainl/vim-cool

modules/home-manager/coding/neovim/config/default.nix

@@ -27,6 +27,7 @@
     ./plugins/telescope.nix
     ./plugins/treesitter.nix
     ./plugins/undotree.nix
+    ./plugins/vim-cool.nix
     ./plugins/vim-dadbod.nix
     ./plugins/vim-highlightedyank.nix
     ./plugins/vim-test.nix

modules/home-manager/coding/neovim/config/plugins/vim-cool.nix

@@ -0,0 +1,5 @@
+{ pkgs, ... }:
+
+{
+  extraPlugins = with pkgs.vimPlugins; [ vim-cool ];
+}