Snippet format update

To match the starter (for the migration)

snippets/chunk.md

@@ -1,4 +1,7 @@
-### chunk
+---
+title: chunk
+tags: array,intermediate
+---
 
 Chunks an array into smaller arrays of a specified size.
 
@@ -15,4 +18,4 @@ const chunk = (arr, size) =>
 
 ```js
 chunk([1, 2, 3, 4, 5], 2); // [[1,2],[3,4],[5]]
-```
+```