feat(nixvim): add nvimtree and keybind

users/modules/programs/nixvim-plugins/nvim-tree.nix

@@ -0,0 +1,27 @@
+{
+  programs.nixvim = {
+    keymaps = [
+      {
+	mode = "n";
+	key = "t";
+	action = ":NvimTreeToggle<CR>";
+      }
+    ];
+    plugins = {
+      web-devicons.enable = true;
+
+      nvim-tree = {
+	enable = true;
+	autoClose = true;
+	disableNetrw = true;
+	hijackNetrw = true;
+	hijackCursor = true;
+	view = {
+	  cursorline = true;
+	  side = "right";
+	  width = "25%";
+	};
+      };
+    };
+  };
+}