remove donate page since it's 404 already

Author: fishercoder1534

README.md

@@ -4,8 +4,6 @@ _If you like this project, please leave me a star._ ★
 
 > ["For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."](https://www.quora.com/How-effective-is-Leetcode-for-preparing-for-technical-interviews)
 
-##If you feel benefited from Leetcode and love it, please consider to [donate to Leetcode](https://leetcode.com/donate/) in order to help us build the best OJ platform.
-
 ## Contributing
 Your ideas/fixes/algorithms are more than welcome!