Fix output path for JupyterLite build

Author: mfisher87

.github/workflows/deploy-to-gh-pages.yml

@@ -40,7 +40,7 @@ jobs:
       - name: "Upload site artifact"
         uses: "actions/upload-pages-artifact@v3"
         with:
-          path: "./_site"
+          path: "./_output"
 
 
   deploy: