revert(autocommand): revert back to markdown autocommand trigger

- reverts b6dae05d63c0ae3ffc13f126f1fa5e818f12c52c
- Some weird behaviour where things where detected as pandoc at random

lua/autocommands.lua

@@ -3,7 +3,7 @@ local spelling = vim.api.nvim_create_augroup("spelling", { clear = true })
 local spell_keymap = require('spelling').spell_keymap
 
 -- Recognize .md as pandoc
-vim.api.nvim_create_autocmd({ "BufNew", "VimEnter" }, {
+vim.api.nvim_create_autocmd({ "BufEnter", "BufWinEnter" }, {
   pattern = { "*.md", },
   group = markdown,
   callback = function()