Duplicated `markdown-preview.nvim` section

[frolvanya]

Both urls are referencing the same plugin, so I think that this one should be removed:

lazyvim.github.io/docs/extras/lang/markdown.md

Lines 124 to 143 in 5cc9614

	## [markdown-preview.nvim](https://github.com/iamcco/markdown-preview.nvim)
	<Tabs>
	<TabItem value="opts" label="Options">
	```lua
	opts = nil
	```
	</TabItem>
	<TabItem value="code" label="Full Spec">
	```lua
	{ "markdown-preview.nvim" }
	```
	</TabItem>