Rename BUPT to UPT to congratulate the national day - University

# Rename BUPT to UPT to congratulate the national day - University

We have to rename our BUPT to UPT, and change our LOGO for the national day in China.

[https://bupt.github.io/announcement/bupt-10-1-problem/](https://bupt.github.io/announcement/bupt-10-1-problem/)