Revert "enable markdown folding 🙏"

This reverts commit c231f2fc2a.

init.lua

@@ -58,8 +58,6 @@ if not vim.loop.fs_stat(lazypath) then
 end
 vim.opt.rtp:prepend(lazypath)
 
-vim.cmd [[ let g:markdown_folding = 1 ]]
-
 -- NOTE: Here is where you install your plugins.
 --  You can configure plugins using the `config` key.
 --