Add ghp-import

.github/workflows/sphinx.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Install dependencies
         run: | 
           python -m pip install --upgrade pip
-          pip install sphinx nbsphinx myst_parser sphinx-copybutton pydata-sphinx-theme
+          pip install sphinx nbsphinx myst_parser sphinx-copybutton pydata-sphinx-theme ghp-import
       - name: Build HTML
         run: | 
           cd docs/