Add prefilter icons

[meomancer]

Child of https://github.com/kartoza/IHE_Delft/issues/4

• [ ] Add models that contains keyword + icon

• [ ] Icons to click on that function as pre-set filters to view outputs related to:

  • Three thematic fields: Water and Health Water for Food River Basins and Deltas
    • Three (or possibly four) focus regions: The Horn of Africa The Middle-East The Sahel

• [ ] When clicked, redirect to dataset view that prefilters by previous selected

[meomancer]

We can show like this now: