Revert back to original software engineering course

The original software engineering course from UBC was not available, and hence was temporarily switched to a Coursera course without any discussion. The original course is now once again available, so we should switch back to it.

README.md

@@ -303,7 +303,7 @@ Courses | Duration | Effort | Prerequisites | Discussion
 [Databases: Semistructured Data](https://www.edx.org/course/semistructured-data)| 2 weeks | 10 hours/week | core programming | [chat](https://discord.gg/duCJ3GN)
 [Machine Learning](https://www.coursera.org/specializations/machine-learning-introduction)| 11 weeks | 9 hours/week | Basic coding | [chat](https://discord.gg/NcXHDjy)
 [Computer Graphics](https://www.edx.org/course/computer-graphics-2) ([alternative](https://cseweb.ucsd.edu/~viscomp/classes/cse167/wi22/schedule.html))| 6 weeks | 12 hours/week | C++ or Java, linear algebra | [chat](https://discord.gg/68WqMNV)
-[Software Engineering: Introduction](https://www.coursera.org/learn/introduction-to-software-engineering) | 4 weeks | 8-10 hours/week | Core Programming, and a [sizable project](FAQ.md#why-require-experience-with-a-sizable-project-before-the-Software-Engineering-courses) | [chat](https://discord.gg/5Qtcwtz)
+[Software Engineering: Introduction](https://www.edx.org/learn/software-engineering/university-of-british-columbia-software-engineering-introduction) | 6 weeks | 8-10 hours/week | Core Programming, and a [sizable project](FAQ.md#why-require-experience-with-a-sizable-project-before-the-Software-Engineering-courses) | [chat](https://discord.gg/5Qtcwtz)
 
 ### Core ethics