chore: removing pubsub design from proposed section (#2904)

Signed-off-by: Jaydip Gabani <gabanijaydip@gmail.com>
Co-authored-by: Rita Zhang <rita.z.zhang@gmail.com>

docs/design/README.md

@@ -7,7 +7,6 @@ Generally, design docs are on Google docs:
 * [Namespace-Scoped Constraints](https://docs.google.com/document/d/1-pY7B5C6R0fjUbDu8izlcP7MSUDVDHv5XK16BFyTGRc/edit#heading=h.w8j68o8vjdts)
 * [Sync Resource](https://docs.google.com/document/d/1ZbXaEh7v_HcgrRu7N-kEucU2pXyq1Rt7cSmmFOBN2q8/edit)
 * [External Data Response Cache](https://docs.google.com/document/d/1nl6iWMmh9CRT0A6cr-Nkfofv9wp210Bkf6ilLq9LLBo/edit)
-* [Export violations using pub-sub](https://docs.google.com/document/d/14QVzdn_fncYLIfZUusCpzrFGWR_aBth_OsR1EsynQeA/edit?usp=sharing)
 * [Gator SyncSet Support](https://docs.google.com/document/d/1mBvy6Y7TDyZswdYlFBHB3Mi2irLVqga_7ZoZvfPIU0A/edit)
 
 ## Implemented