Update README.md

Author: huhuhang

README.md

@@ -14,8 +14,6 @@ In this path, you will learn and practice basic C++ programming. Then, you will
 
 ## More Courses
 
-## More Courses
-
 - [Practice Linux Programming Courses](https://github.com/labex-labs/practice-linux-programming-courses)
 - [Practice Python Programming Courses](https://github.com/labex-labs/practice-python-programming-courses)
 - [Practice DevOps Programming Courses](https://github.com/labex-labs/practice-devops-programming-courses)