Fix gh-pages

Author: coot

.github/workflows/github-page.yml

@@ -59,7 +59,7 @@ jobs:
 
     - name: Build Haddock documentation 🔧
       run: |
-        cabal haddock-package --hackage all
+        cabal haddock-project --hackage all
 
     - name: Upload artifacts
       uses: actions/upload-pages-artifact@v1