Snippet format update

To match the starter (for the migration)

snippets/pad.md

@@ -1,4 +1,7 @@
-### pad
+---
+title: pad
+tags: string,beginner
+---
 
 Pads a string on both sides with the specified character, if it's shorter than the specified length.
 
@@ -14,4 +17,4 @@ const pad = (str, length, char = ' ') =>
 pad('cat', 8); // '  cat   '
 pad(String(42), 6, '0'); // '004200'
 pad('foobar', 3); // 'foobar'
-```
+```