site/docs: regenerate static website using Hugo

For now it's manual:

$ cd site
$ rm -rf docs/*
$ hugo

I will explore making this automatic using a GitHub Action.

site/docs/global-iseal-system-element/global-iseal-system-element.txt

@@ -0,0 +1,19 @@
+Assurance assessment and audit methodology
+Assurance management
+Assurance oversight and accreditation
+Assurance systems
+Capacity building
+Claims management
+Data and information management
+Grievances, complaints and appeals
+MandE communicating impact
+MandE learning and improvement
+MandE outcomes and impacts
+MandE performance monitoring
+Risk management
+Stakeholder engagement and management
+Standard revision
+Standard setting
+System governance
+Theory of change
+Traceability and chain of custody