Remove circular TOC reference
Remove circular TOC reference

The circular reference raises a warning with the current dependency
versions but oslosphinx >=4.0 seems to fail harder on it. Removing the
useless TOC and then empty Reference section.

Change-Id: Iac7d947b6a683f8cdb3b5378c9f82d70a1707d26

openstack/python-searchlightclient,openstack/python-searchlightclient