Move space invaders video to Borr Project Youtube channel

It was earlier on my VirtualHub channel. Also, change the video link format to make the video open normally, instead of as youtube shorts.

Author: pulkitkrishna00

docs/computer-science/program-design/spd/index.md

@@ -22,7 +22,7 @@ Alternative Links (Not recommended):
 
 - The course does not have a homepage on Edx, but don't worry about it. Open the [link](https://learning.edx.org/course/course-v1:UBCx+SPD1x+2T2015) given above, log in (if you are not logged in) and then enroll in the course.
 - Work through Week 1A to Week 6A as given in the course overview. Watch the videos, do the exercises, and then solve the problems from the problem bank.
-- After you complete, Week 6A, do the [space invaders problem](https://github.com/BorrProject/spd-starters/blob/main/final/space-invaders-starter.rkt). You can find further instructions here: [Space Invaders Instructions](https://github.com/BorrProject/borrproject.github.io/blob/main/docs/computer-science/coursepages/space-invaders-instructions.png). You can watch a sample run of the game [here](https://www.youtube.com/shorts/wUg3psZl7vM).
+- After you complete, Week 6A, do the [space invaders problem](https://github.com/BorrProject/spd-starters/blob/main/final/space-invaders-starter.rkt). You can find further instructions here: [Space Invaders Instructions](https://github.com/BorrProject/borrproject.github.io/blob/main/docs/computer-science/coursepages/space-invaders-instructions.png). You can watch a sample run of the game [here](https://youtube.com/video/7dEciy3f7UU).
 - Then, work through Week 6B onwards. Watch the videos, do the exercises, and then solve the problems from the problem bank.
 - After that, watch the extra videos in [this playlist](https://www.youtube.com/playlist?list=PL6NenTZG6KrqdcyTwGf09uBxjI5pbXuT7).
 - After you complete all the modules in the course, do the [TA solver problem](https://github.com/BorrProject/spd-starters/blob/main/final/ta-solver-starter.rkt). You will find the instructions in the starter file.