Remove the html_static directory from conf.py; it doesn't exist anywa…

…y and is just creating a warning that's causing Jenkins to see the build as unstable

conf.py

@@ -124,7 +124,7 @@
 # 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,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = []
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.