Oqp updates

This PR will create GeoNode maps for the isc, ghec and gaf layers. It also update the topic categories with some sample categories as a proof of concept. The final topic categories still need to be defined.

When installed, the fixtures should add a isc, ghec and gaf maps to /maps/
I gave it the name temp because we intend to improve dramatically this page. So these landing pages are truly just temporary.