nvim-config/lua/custom/plugins/markdown.lua

-- Markdown preview plugin
return {
  {
    'iamcco/markdown-preview.nvim',
    cmd = { 'MarkdownPreviewToggle', 'MarkdownPreview', 'MarkdownPreviewStop' },
    build = 'cd app; npm install',
    init = function()
      vim.g.mkdp_filetypes = { 'markdown' }
    end,
    ft = { 'markdown' },
  },
}