fix: incorrect filepath links

Author: liamjberrisford

programme_information/intro_to_gpus.ipynb

@@ -27,9 +27,9 @@
     "## Pre-requisite Knowledge\n",
     "\n",
     "- An account on ISCA\n",
-    "- Attended [Introduction to HPC](introduction_to_hpc.md) or equivalent experience.\n",
-    "- Attended [Introduction to UNIX](introduction_to_unix.md) or equivalent experience.\n",
-    "- Attended [Introduction to Python](introduction_to_python.md) or equivalent experience. \n",
+    "- Attended [Introduction to HPC](../individual_modules/section_landing_pages/introduction_to_hpc.md) or equivalent experience.\n",
+    "- Attended [Introduction to UNIX](../individual_modules/section_landing_pages/introduction_to_unix.md) or equivalent experience.\n",
+    "- Attended [Introduction to Python](../individual_modules/section_landing_pages/introduction_to_python.md) or equivalent experience. \n",
     "\n",
     "## Sign-up \n",
     "\n",