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-description-member-contributor/index.md

@@ -0,0 +1,9 @@
+---
+title: 'ISEAL - member contributor'
+field: 'is.contributor.member'
+slug: 'resource-description-member-contributor'
+description: 'Association with an ISEAL member organization or scheme - select from control list'
+required: True
+vocabulary: 'resource-description-member-contributor.txt'
+policy: 'Controlled value. Multi select from control list.'
+---

site/content/terms/resource-description-member-contributor/resource-description-member-contributor.txt

@@ -0,0 +1,24 @@
+Alliance for Water Stewardship
+Aluminium Stewardship Initiative
+Aquaculture Stewardship Council
+Assurance Services International
+Better Cotton Initiative
+Bonsucro
+Fair Trade USA
+Fairtrade International
+Forest Stewardship Council
+GEO Foundation
+Global Coffee Platform
+Global Infrastructure Basel
+GoodWeave
+IFFO RS
+Linking Environment And Farming
+Marine Stewardship Council
+Rainforest Alliance
+Responsible Jewellery Council
+Roundtable on Sustainable Palm Oil
+Sustainable Agriculture Network
+Textile Exchange
+The Gold Standard
+Union for Ethical BioTrade
+UTZ