add tree file view, and modify scrollbar

lua/core/auto.lua

@@ -71,11 +71,3 @@ a.nvim_create_autocmd('FileType', {
   pattern = '*',
   command = 'hi NonText guifg=bg'
 })
-
--- source and compile lua conf when written
-local packer_group = a.nvim_create_augroup('Packer', { clear = true })
-vim.api.nvim_create_autocmd('BufWritePost', {
-  command = 'source <afile>',
-  group = packer_group,
-  pattern = vim.fn.expand '$MYVIMRC',
-})