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-sdg-focus/index.md

@@ -0,0 +1,9 @@
+---
+title: 'Scope - SDG focus'
+field: 'is.focus.sdg'
+slug: 'resource-scope-sdg-focus'
+description: 'Association to sustainable development goal(s) - select from control list'
+required: False
+vocabulary: 'resource-scope-sdg-focus.txt'
+policy: 'Controlled value. Multi select from control list.'
+---

site/content/terms/resource-scope-sdg-focus/resource-scope-sdg-focus.txt

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+SDG 1 - No poverty
+SDG 2 - Zero hunger
+SDG 3 - Good health and well-being
+SDG 4 - Quality education
+SDG 5 - Gender equality
+SDG 6 - Clean water and sanitation
+SDG 7 - Affordable and clean energy
+SDG 8 - Decent work and conomic growth
+SDG 9 - Industry, innovation and infrastructure
+SDG 10 - Reduce inequalities
+SDG 11 - Sustainable cities and communities
+SDG 12 - Responsible production and consumption
+SDG 13 - Climate action
+SDG 14 - Life below water
+SDG 15 - Life on land
+SDG 16 - Peace, justice and strong institutions
+SDG 17 - Partnerships for the goals
+None