Add sphinx theme furo

.devcontainer/Dockerfile

@@ -18,7 +18,8 @@ ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 RUN pip install --no-cache-dir \
     "maturin>=0.9,<0.10" \
     sphinx \
-    sphinx-autobuild
+    sphinx-autobuild \
+    furo
 
 # Change owner to the devcontainer user
 RUN chown -R 1000:1000 $VIRTUAL_ENV

python/docs/conf.py

@@ -22,7 +22,7 @@ exclude_patterns = ["build", "Thumbs.db", ".DS_Store"]
 
 # -- Options for HTML output -------------------------------------------------
 
-html_theme = "classic"
+html_theme = "furo"
 html_static_path = []
 html_logo = "../../logo.svg"
 html_favicon = "../../logo.svg"