Revert "refactor(#2871, #2886): multi instance: node classes created (#2916)"

This reverts commit 38aac09151.

lua/nvim-tree/explorer/sorters.lua

@@ -111,7 +111,7 @@ local function split_merge(t, first, last, comparator)
 end
 
 ---Perform a merge sort using sorter option.
----@param t Node[]
+---@param t table nodes
 function Sorter:sort(t)
   if self.user then
     local t_user = {}