Fixed link

Author: Gammerdinger

schedule/README.md

@@ -108,7 +108,7 @@ II. **Complete the exercises**:
 |:-----------:|:----------:|:--------:|
 | 9:30 - 10:00 | Self-learning lessons review | All |
 | 10:00 - 11:00 | [Introduction to the O2 cluster](../lectures/HPC_intro_O2_20250127_kmk34_edits.pdf) | Will |
-| 11:00 - 11:30 | [Exercise](../activities/sbatch_exercise.md) ([answer key](https://raw.githubusercontent.com/hbctraining/Intro-to-shell-flipped/master/activities/sbatch_exercise_answer.txt))| Upen |
+| 11:00 - 11:30 | [Exercise](../activities/sbatch_exercise.md) ([answer key](../activities/sbatch_exercise_answer.txt))| Upen |
 | 11:30 - 11:45 | Introduction to the O2 cluster - data storage| Will |
 | 11:45 - 12:00 | [Wrap up](../lectures/workshop_wrapup_slides.pdf) | Upen |