nvim-config/ftdetect/markdown.lua

vim.api.nvim_create_autocmd({ "BufNewFile", "BufFilePost", "BufRead" }, {
  pattern = "*.md",
  callback = function()
    vim.bo.filetype = "markdown"
    vim.bo.syntax = "markdown"
    vim.o.colorcolumn = "80"
    vim.bo.textwidth = 0
    vim.bo.comments = ""
    vim.o.colorcolumn = ""
    vim.o.wrap = true
    vim.o.linebreak = true
    vim.keymap.set({"n"}, "j", "gj")
    vim.keymap.set({"n"}, "k", "gk")
  end,
})