Removes a broken link from the sidebar of Sphinx built pages.
Removes a broken link from the sidebar of Sphinx built pages.

Change-Id: I1c24f015bd8b67b1dc85eda67a0669ac79ca282b

scottdangelo/RemoveVolumeMangerLocks,petrutlucian94/cinder,takeshineshiro/cinder,Hybrid-Cloud/cinder,Accelerite/cinder,manojhirway/ExistingImagesOnNFS,bswartz/cinder,eharney/cinder,scottdangelo/RemoveVolumeMangerLocks,ge0rgi/cinder,redhat-openstack/cinder,NetApp/cinder,spring-week-topos/cinder-week,j-griffith/cinder,Paul-Ezell/cinder-1,rickerc/cinder_audit,Thingee/cinder,CloudServer/cinder,nexusriot/cinder,scality/cinder,Thingee/cinder,inkerra/cinder,potsmaster/cinder,Accelerite/cinder,tlakshman26/cinder-new-branch,JioCloud/cinder,cloudbase/cinder,duhzecca/cinder,tlakshman26/cinder-https-changes,Nexenta/cinder,JioCloud/cinder,apporc/cinder,eharney/cinder,sasukeh/cinder,takeshineshiro/cinder,rakeshmi/cinder,blueboxgroup/cinder,hguemar/cinder,openstack/cinder,leilihh/cinder,sasukeh/cinder,bswartz/cinder,abusse/cinder,Paul-Ezell/cinder-1,alex8866/cinder,duhzecca/cinder,abusse/cinder,Akrog/cinder,ntt-sic/cinder,Thingee/cinder,nexusriot/cinder,redhat-openstack/cinder,julianwang/cinder,winndows/cinder,apporc/cinder,tlakshman26/cinder-https-changes,leilihh/cinder,github-borat/cinder,NetApp/cinder,winndows/cinder,scality/cinder,alex8866/cinder,j-griffith/cinder,NeCTAR-RC/cinder,manojhirway/ExistingImagesOnNFS,mahak/cinder,cloudbau/cinder,dims/cinder,cloudbase/cinder,blueboxgroup/cinder,tlakshman26/cinder-new-branch,saeki-masaki/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,openstack/cinder,maelnor/cinder,nikesh-mahalka/cinder,ntt-sic/cinder,saeki-masaki/cinder,dims/cinder,potsmaster/cinder,inkerra/cinder,NeCTAR-RC/cinder,Akrog/cinder,CloudServer/cinder,Datera/cinder,hguemar/cinder,phenoxim/cinder,rakeshmi/cinder,julianwang/cinder,Hybrid-Cloud/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,github-borat/cinder,Datera/cinder,Nexenta/cinder,mahak/cinder,spring-week-topos/cinder-week,phenoxim/cinder,maelnor/cinder,cloudbau/cinder,rickerc/cinder_audit,petrutlucian94/cinder,nikesh-mahalka/cinder