fix: remove codepen.io links from challenge articles

guide/chinese/certifications/javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords/index.md

@@ -41,7 +41,6 @@ localeTitle: 比较var的范围并让关键字
     } 
 ```
 
-![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 "：火箭：") [运行代码](https://codepen.io/dylantyates/pen/wxwxRd)
 
 # 代码说明：
 

guide/chinese/certifications/javascript-algorithms-and-data-structures/es6/declare-a-read-only-variable-with-the-const-keyword/index.md

@@ -47,7 +47,6 @@ localeTitle: 使用const关键字声明只读变量
     printManyTimes("freeCodeCamp"); 
 ```
 
-![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 "：火箭：") [运行代码](https://codepen.io/dylantyates/pen/OwVxyx)
 
 # 代码说明：
 

guide/chinese/certifications/javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords/index.md

@@ -37,7 +37,6 @@ localeTitle: 探索var和let关键字之间的差异
     catTalk(); 
 ```
 
-![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 "：火箭：") [运行代码](https://codepen.io/dylantyates/pen/eKqoGY)
 
 # 代码说明：
 

guide/chinese/certifications/javascript-algorithms-and-data-structures/es6/mutate-an-array-declared-with-const/index.md

@@ -41,7 +41,6 @@ localeTitle: 改变用const声明的数组
     editInPlace(); 
 ```
 
-![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 "：火箭：") [运行代码](https://codepen.io/dylantyates/pen/djoVjW)
 
 # 代码说明：
 

guide/chinese/certifications/javascript-algorithms-and-data-structures/es6/prevent-object-mutation/index.md

@@ -44,7 +44,6 @@ localeTitle: 防止对象突变
     const PI = freezeObj(); 
 ```
 
-![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 "：火箭：") [运行代码](https://codepen.io/dylantyates/pen/OwVxYB)
 
 # 代码说明：
 

guide/chinese/certifications/javascript-algorithms-and-data-structures/es6/write-higher-order-arrow-functions/index.md

@@ -48,7 +48,6 @@ localeTitle: 编写高阶箭头函数
     console.log(squaredIntegers); 
 ```
 
-![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 "：火箭：") [运行代码](https://codepen.io/dylantyates/pen/WyWoYJ)
 
 # 代码说明：