cd to folder when doing nvim FOLDER and layout code

- when doing `nvim FOLDER` it works as expected, opening the tree
on the correct folder (updating the ROOT_PATH)
- add the code for keeping the tree window on the side no matter
what, but since the lack of window events, disable this feature.

plugin/tree.vim

@@ -12,6 +12,12 @@ au BufWritePost * lua require'tree'.refresh()
 au BufEnter * lua require'tree'.check_windows_and_close()
 au VimEnter * lua require'tree'.check_buffer_and_open()
 
+" TODO: WinEnter is not the right autocommand for this task,
+" but we do not have LayoutChange or WinMove kind of option atm,
+" so this is deactivated by default to avoid messing up users workflows
+
+" au WinEnter * lua require'tree'.replace_tree()
+
 command! LuaTreeToggle lua require'tree'.toggle()
 command! LuaTreeRefresh lua require'tree'.refresh()