Update GitHub repository link in mri-xray.mdx

Author: chourroutm

src/pages/mri-xray.mdx

@@ -16,7 +16,7 @@ hide_table_of_contents: true
   </div>
   <div className="resource-card">
     <h3>💻 Source Code</h3>
-    <p>[Repository](https://github.com/lincbrain) on GitHub (Coming soon)</p>
+    <p>[Repository](https://github.com/UCL-MXI-Bio/2026-chourrout-linc-dmri-xray-pipeline) on GitHub</p>
   </div>
   <div className="resource-card">
     <h3>Acknowledgements</h3>