Update file conf.py

docs/source/conf.py

@@ -14,7 +14,13 @@ release = '0.1'
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
-extensions = []
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+   'sphinx_rtd_theme'
+]
+
 
 templates_path = ['_templates']
 exclude_patterns = []