Rename to quicknxs

Renaming the data repo as part of the renaming to quicknxs effort

The repository will be renamed to quicknxs as part of this MR

https://ornlrse.clm.ibmcloud.com/ccm/web/projects/Neutron%20Data%20Project%20(Change%20Management)#action=com.ibm.team.workitem.viewWorkItem&id=5616

https://github.com/neutrons/reflectivity_ui/pull/119