Remove last update time in the footer

- It's not that important when we have the sbws version stated nearby
- It *really* means last built, and that isn't generally useful to know.
  For example, the onion service is updated every hour (or something).
  So it always says today or yesterday

docs/source/conf.py

@@ -106,7 +106,7 @@ html_static_path = ['_static']
 #
 # html_sidebars = {}
 
-html_last_updated_fmt = ''
+# html_last_updated_fmt = ''
 
 # -- Options for HTMLHelp output ---------------------------------------------