fix link to space invaders instructions

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://youtube.com/video/7dEciy3f7UU).
+- 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](./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.