📚 update doc build config

templates/docs/conf.py_t

@@ -89,7 +89,7 @@ exclude_patterns = [{{ exclude_patterns }}]
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+html_theme = 'sphinx_rtd_theme'
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,