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-sector/index.md

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

site/content/terms/resource-scope-sector/resource-scope-sector.txt

@@ -0,0 +1,29 @@
+Agriculture
+Aquaculture
+Banking and Financial Services
+Communications
+Conflict, Peace and Security
+Construction
+Consumer products
+Education
+Electronics
+Energy
+Environment Protection
+Fishing
+Forestry
+Government and Civil Society
+Health )
+Industry
+Infrastructure
+Jewelry
+Livestock
+Mineral Resources and Mining
+Processed food
+Services
+Sport
+Textiles/Garment
+Tourism
+Toys
+Trade
+Transport and Storage
+Water Supply and Sanitation