docs: update the link to tutorialhorizon about circular linked list (TheAlgorithms#239)

Author: vil02

en/Data Structures/Linked Lists/Circular Linked List.md

@@ -37,7 +37,7 @@ The Linked List has a ```pointer``` to the adjacent elements but the last node i
 
 ### SLL v.s. CLL
 
-![image](https://i0.wp.com/algorithms.tutorialhorizon.com/files/2016/03/Circular-Linked-List.png)
+![image](https://tutorialhorizon.com/static/media/algorithms/2016/03/Circular-Linked-List.png)
 
 ### Example
 

ko/자료구조/연결 리스트/원형 연결 리스트.md

@@ -37,7 +37,7 @@
 
 ### SLL v.s. CLL
 
-![영상](https://i0.wp.com/algorithms.tutorialhorizon.com/files/2016/03/Circular-Linked-List.png)
+![영상](https://tutorialhorizon.com/static/media/algorithms/2016/03/Circular-Linked-List.png)
 
 ### 예시