utils: Improve mapping function | Properly lazy load whichkey

just add desc with normal vim.keymap.set function

whichkey will automatically use the descriptions

lua/plugins/init.lua

@@ -204,6 +204,7 @@ local plugins = {
   ["folke/which-key.nvim"] = {
     disable = true,
     module = "which-key",
+    keys = "<leader>",
     config = function()
       require "plugins.configs.whichkey"
     end,