Add nvim-lazy submodule and add plugin configuration.

pkgsets/nvim/which-key.nix

@@ -0,0 +1,36 @@
+{
+  lib,
+  config,
+  ...
+}:
+
+lib.mkIf (lib.elem "nvim::which-key" config.machine.pkgs) {
+  programs.nvim-lazy.lazyPlugins = [
+    {
+      dir = vPlug: vPlug.which-key-nvim;
+      event = [ "VeryLazy" ];
+      keys = [
+        {
+          bind = "<leader>?";
+          cmdIsFunction = true;
+          cmd = # lua
+            ''
+              function()
+                require("which-key").show({ global = false })
+              end
+            '';
+          opts = {
+            desc = "Buffer Local Keymaps (which-key)";
+          };
+        }
+      ];
+      init = # lua
+        ''
+          function()
+            vim.o.timeout = off
+            vim.o.ttimeout = off
+          end
+        '';
+    }
+  ];
+}