pkgdown site: temporarily fix pkgdown at 2.0.9 to restore visuals

Author: florisvdh

.github/workflows/pkgdown.yaml

@@ -41,7 +41,7 @@ jobs:
 
       - uses: r-lib/actions/setup-r-dependencies@v2
         with:
-          extra-packages: any::pkgdown, local::.
+          extra-packages: local::., [email protected]
           needs: website
 
       - name: Deploy package