added more tools, replaced outline.nvim with arial.nvim.

nix/nvim/treesitter/arial.nix

@@ -0,0 +1,23 @@
+{
+  configs,
+  pkgs,
+  ...
+}: {
+  programs.nixvim = {
+    keymaps = [
+      {
+        action = ":AerialToggle!<CR>";
+        key = "<leader>o";
+        mode = "n";
+        options = {
+          silent = true;
+          desc = "toggle outline";
+        };
+      }
+    ];
+    extraPlugins = [
+        pkgs.vimPlugins.aerial-nvim
+    ];
+    extraConfigLua=''require("aerial").setup({})'';
+  };
+}

nix/nvim/treesitter/treesitter.nix

@@ -15,8 +15,10 @@
     extraPlugins = [
       pkgs.vimPlugins.treesj
     ];
+    extraConfigLua=''require("treesj").setup({})'';
   };
   imports = [
     ./rainbow-delimiters.nix
+    ./arial.nix
   ];
 }