Snippet format update

To match the starter (for the migration)

snippets/shank.md

@@ -1,4 +1,7 @@
-### shank
+---
+title: shank
+tags: array,intermediate
+---
 
 Has the same functionality as [`Array.prototype.splice()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice), but returning a new array instead of mutating the original array.
 
@@ -20,4 +23,4 @@ const names = ['alpha', 'bravo', 'charlie'];
 const namesAndDelta = shank(names, 1, 0, 'delta'); // [ 'alpha', 'delta', 'bravo', 'charlie' ]
 const namesNoBravo = shank(names, 1, 1); // [ 'alpha', 'charlie' ]
 console.log(names); // ['alpha', 'bravo', 'charlie']
-```
+```