tests: delete unused code

Change-Id: I305e9d1a46b69196ab89a0de8ddb90ee9ce263ad
diff --git a/manpages/conf.py b/manpages/conf.py
index 79e603b..26606ea 100644
--- a/manpages/conf.py
+++ b/manpages/conf.py
@@ -27,8 +27,7 @@
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
 needs_sphinx = '4.0'
-extensions = [
-]
+extensions = []
 
 templates_path = ['_templates']
 exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']