Notify superdb-website repo instead of zed-doc-site when docs change

.github/workflows/notify-docs-update.yaml

@@ -13,4 +13,4 @@ jobs:
     steps:
     - name: Send dispatch event
       run: |
-        curl -XPOST -u "${{ secrets.PAT_USERNAME }}:${{ secrets.PAT_TOKEN }}" -H "Accept: application/vnd.github.v3+json"  -H "Content-Type: application/json" https://api.github.com/repos/brimdata/zed-docs-site/dispatches --data '{"event_type":"zed-docs-update"}'
+        curl -XPOST -u "${{ secrets.PAT_USERNAME }}:${{ secrets.PAT_TOKEN }}" -H "Accept: application/vnd.github.v3+json"  -H "Content-Type: application/json" https://api.github.com/repos/brimdata/superdb-website/dispatches --data '{"event_type":"superdb-docs-update"}'