neovim: remove unnecessary autocmd

neovim/.config/nvim/after/plugin/aus.lua

@@ -15,20 +15,3 @@ vim.api.nvim_create_autocmd("BufEnter", {
     vim.cmd(":checktime")
   end,
 })
-
-local function open_nvim_tree(data)
-  -- buffer is a directory
-  local directory = vim.fn.isdirectory(data.file) == 1
-
-  if not directory then
-    return
-  end
-
-  -- change to the directory
-  vim.cmd.cd(data.file)
-
-  -- open the tree
-  require("nvim-tree.api").tree.open()
-end
-
-vim.api.nvim_create_autocmd({ "VimEnter" }, { callback = open_nvim_tree })