Add initial version of schema specification site

After running the util/generate_docs.py script to parse and extract
the metadata term specifications and their controlled vocabularies,
we use Hugo to generate the HTML site. The HTML site uses Bootstrap
with several ISEAL brand colors gleaned from the corporate website.

site/content/terms/resource-scope-system-element/index.md

@@ -0,0 +1,9 @@
+---
+title: 'ISEAL - system element'
+field: 'is.focus.systemElement'
+slug: 'resource-scope-system-element'
+description: 'select from control list'
+required: False
+vocabulary: 'resource-scope-system-element.txt'
+policy: 'Controlled value. Multi select from control list.'
+---

site/content/terms/resource-scope-system-element/resource-scope-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