Apply new format to snippets and template

snippets/similarity.md

@@ -5,7 +5,7 @@ tags: array,math,beginner
 
 Returns an array of elements that appear in both arrays.
 
-Use `Array.prototype.filter()` to remove values that are not part of `values`, determined using `Array.prototype.includes()`.
+- Use `Array.prototype.filter()` to remove values that are not part of `values`, determined using `Array.prototype.includes()`.
 
 ```js
 const similarity = (arr, values) => arr.filter(v => values.includes(v));
@@ -13,4 +13,4 @@ const similarity = (arr, values) => arr.filter(v => values.includes(v));
 
 ```js
 similarity([1, 2, 3], [1, 2, 4]); // [1, 2]
-```
+```