Apply new format to snippets and template

snippets/initial.md

@@ -5,7 +5,7 @@ tags: array,beginner
 
 Returns all the elements of an array except the last one.
 
-Use `arr.slice(0,-1)` to return all but the last element of the array.
+- Use `arr.slice(0,-1)` to return all but the last element of the array.
 
 ```js
 const initial = arr => arr.slice(0, -1);
@@ -13,4 +13,4 @@ const initial = arr => arr.slice(0, -1);
 
 ```js
 initial([1, 2, 3]); // [1,2]
-```
+```