(nvim) Fix markdown-preview.nvim plugins

See:
iamcco/markdown-preview.nvim#691
iamcco/markdown-preview.nvim#690

Author: emilmgeorge

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

@@ -13,7 +13,12 @@ end
 function M.setup()
 	return {
 		'iamcco/markdown-preview.nvim',
-		build = function() vim.fn["mkdp#util#install"]() end,
+		cmd = { "MarkdownPreviewToggle", "MarkdownPreview", "MarkdownPreviewStop" },
+		ft = { "markdown" },
+		build = function()
+			require("lazy").load { plugins = { "markdown-preview.nvim" } }
+			vim.fn["mkdp#util#install"]()
+		end,
 		config = M.configure,
 	}
 end