Post NCS 3.3/3.4 a decision was made to deprecate the JS framework. The only GUI that is available is the auto-generated one, to be used for admin purpose. Anything else is for demo only (I suspect that this is the case with the NFVO webui).
The idea is for any web portal/app server to be north of NSO, sized as required. It would then call the APIs exposed by NSO.