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-delta-sustainability-indicators/index.md

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+---
+title: 'Scope - Delta sustainability indicators'
+slug: 'resource-scope-delta-sustainability-indicators'
+description: 'Farm - level, outcome/impact indicators across the social, economic and environmental dimensions of sustainability - select from control list'
+required: False
+vocabulary: 'resource-scope-delta-sustainability-indicators.txt'
+policy: 'Controlled value. Multi select from control list.'
+---

site/content/terms/resource-scope-delta-sustainability-indicators/resource-scope-delta-sustainability-indicators.txt

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+1 - Use of highly hazardous pesticides
+2 - Pesticide risk
+3 - Irrigation water management
+3.1 - Water extracted for irrigation
+3.2 - Irrigation efficiency
+3.3 - Water productivity
+4 - Top soil carbon content
+5 - Fertilizer use by type
+6 - Forest, wetland and grassland converted for production
+7 - Greenhouse gas emissions
+8 - Average yield
+9 - Gross margin from production
+10 - Price at farm gate
+11 - Proportion of workers earning a legal minimum wage
+12 - Incidence of child labour
+13 - Incidence of forced labour
+14 - Women's empowerment
+15 - Frequency of on-farm fatalities and non-fatalities