site/content: regenerate terms

This is based on the new cluster/module re-organization by Peter
last week: idss_schema_fields_new2.xlsx

site/content/terms/impact-evidence-summary/index.md

@@ -0,0 +1,10 @@
+---
+title: 'Evidence summary'
+field: 'is.evidenceSummary'
+slug: 'impact-evidence-summary'
+description: 'A narrative summary of the evidence presented in the resource.'
+required: False
+module: 'Impact'
+cluster: 'Impact'
+policy: 'Free value. Single value only.'
+---