Add markdown linting (without breaking the site this time!)

manuscript/recipes/autopirate/headphones.md

@@ -2,6 +2,7 @@
 description: Headphones is an automated music downloader for NZB and BitTorrent
 ---
 # Headphones
+
 !!! warning
     This is not a complete recipe - it's a component of the [autopirate](/recipes/autopirate/) "_uber-recipe_", but has been split into its own page to reduce complexity.
 
@@ -51,4 +52,4 @@ headphones_proxy:
 
 --8<-- "premix-cta.md"
 --8<-- "recipe-autopirate-toc.md"
---8<-- "recipe-footer.md"
+--8<-- "recipe-footer.md"