fix: conf.py
@@ -57,3 +57,6 @@ html_theme = 'sphinx_rtd_theme'
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
html_static_path = ['_static']
+
+# The master toctree document.
+master_doc = 'index'
