Update clubs.md

Author: shannona

_pages/clubs.md

@@ -106,6 +106,7 @@ Again, see [Gordian Technology](/clubs/technology/) for how all of this fits tog
 * [Gordian Technology](/clubs/technology/)
 * [ocaps and Delegation](/clubs/ocaps/)
 * [Project Xanadu History](/clubs/history/)
+* [Hubert Dead-Drop Hub](/hubert/)
 
 **Demos:**