point at the repo version (ubseds6) shown in the image, rather than the head which has changed a bit

well it's almost the same version

index.html

@@ -33,7 +33,7 @@ scroll: true
 
   <p>
     You can find the source and design files for this project in our
-    <a href="https://github.com/bristol-seds/pico-tracker">Github
+    <a href="https://github.com/bristol-seds/pico-tracker/tree/78ec05c94ab71e52705f0ff389186d28a2218643">Github
     Repository</a>. For exact order codes and suppliers check the
     <a href="https://github.com/bristol-seds/pico-tracker/blob/658076c468c942b24b821abce0444dd99bf14361/hardware/Parts.md">Parts
     List</a>.