Implemented TemplateList view using new TemplateListLinked serializer;
Renamed TemplateLinked to TemplateDetailModel and made it a simple ModelSerializer;
Added templates to API root view
Added DjangoFilterBackend as default backend for DRF
Added some filters to EntityList and TemplateLIst
Implemented TemplateNodeLatestList view and TemplateNodeList view
Added Nodes collection;
Initial implementation of nodes_list;
Added some styling for nodes and entities lists