Improved route structure for dashboard

Restructure routes as follows:

• /dashboard just shows descriptors

  • /dashboard/descriptors shows my Descriptors
  • /dashboard/datasets shows my Datasets
  • /dashboard/p/datasets shows Published datasets
  • /dashboard/p/descriptors shows Published descriptors

• /datasets/{UUID} should show published dataset and not the editor

• /datasets/{UUID}/edit should show the editor