Fix workflow file

Author: simonsan

.github/workflows/publish.yml

@@ -53,6 +53,7 @@ jobs:
               MDBOOK_BOOK__LANGUAGE=$po_lang \
               MDBOOK_OUTPUT__HTML__SITE_URL=/patterns/$po_lang/ \
               mdbook build -d book/$po_lang
+              mv book/$po_lang/html book/html/$po_lang
               echo "::endgroup::"
           done
 
@@ -63,7 +64,7 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v1
         with:
-          path: ./book
+          path: book/html
 
       - name: Deploy to GitHub Pages
         id: deployment