docs: update DM docs URL

Author: tdudgeon

pages/docs/developer.mdx

@@ -17,7 +17,7 @@ import Head from "next/head";
 
 ## Quick Links
 
-* [Data Manager docs](https://informaticsmatters.gitlab.io/mini-apps-data-tier/) - design docs for the Data Manager and
+* [Data Manager docs](https://informaticsmatters.gitlab.io/squonk2-data-manager/) - design docs for the Data Manager and
   a guide to creating new jobs
 * [Account Server docs](https://informaticsmatters.gitlab.io/squonk2-account-server/) - design docs for the Account server
 * [Python client](https://squonk2-python-client.readthedocs.io/en/stable) |