DOC: fix docs build

Author: tacaswell

.github/workflows/docs.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install mpl-gui
         run: python -m pip install -v .
       - name: Build
-        run: make -Cdocs html
+        run: make -Cdocs singlehtml
       - name: Publish
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
         uses: peaceiris/actions-gh-pages@v3

requirements-doc.txt

@@ -0,0 +1,7 @@
+# List required packages in this file, one per line.
+matplotlib
+mpl-sphinx-theme
+numpydoc
+sphinx
+sphinx-copybutton
+ipython