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-coverage-regions/index.md

@@ -0,0 +1,9 @@
+---
+title: 'Coverage - regions'
+field: 'is.coverage.region'
+slug: 'resource-coverage-regions'
+description: 'Popular names for regions - select from control list'
+required: False
+vocabulary: 'resource-coverage-regions.txt'
+policy: 'Controlled value. Multi select from control list.'
+---

site/content/terms/resource-coverage-regions/resource-coverage-regions.txt

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+Africa
+Asia
+Caribbean
+Central America
+Central Asia
+Eastern Africa
+Eastern Asia
+Eastern Europe
+Europe
+Latin America
+Melanesia
+Micronesia
+Middle Africa
+North America
+Northern Africa
+Northern Europe
+Oceania
+Polynesia
+South America
+South-eastern Asia
+Southern Africa
+Southern Asia
+Southern Europe
+Sub-Saharan Africa
+Western Africa
+Western Asia
+Western Europe