Fix broken link in typescript migration.md

Author: clairep94

contributor_docs/typescript_migration.md

@@ -2,7 +2,7 @@
 
 This repository is undergoing a Typescript migration, initiated through the **2025 pr05 Grant: Incremental Typescript Migration of the p5.js Web Editor**, running **July – October 31, 2025**.
 
-For further details on the initial migration project, please see the [project appendix](./pr05_2025_typescript_migration.md)
+For further details on the initial migration project, please see the [project appendix](pr05_2025_typescript_migration/index.md)
 
 Below are some guidelines on completing the migration.