Make research_view the default dataset view

Sets the concise research_view table as the default subset so the Hub opens on the most useful ten-row analytical view.

README.md

@@ -15,6 +15,7 @@ tags:
   - evidence-index
 configs:
   - config_name: research_view
+    default: true
     data_files: [{split: data, path: data/research_view.csv}]
   - config_name: case_catalog
     data_files: [{split: data, path: data/case_catalog.csv}]