Snippet format update

To match the starter (for the migration)

snippets/digitize.md

@@ -1,4 +1,7 @@
-### digitize
+---
+title: digitize
+tags: math,array,beginner
+---
 
 Converts a number to an array of digits.
 
@@ -11,4 +14,4 @@ const digitize = n => [...`${n}`].map(i => parseInt(i));
 
 ```js
 digitize(123); // [1, 2, 3]
-```
+```