Add Hugo-based (https://gohugo.io) documentation

hugo/content/introduction/_index.md

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+---
+title: Introduction
+weight: -1
+---

hugo/content/introduction/architecture.md

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+---
+title: Architecture
+weight: 3
+---
+

hugo/content/introduction/author.md

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+---
+title: Author and License
+weight: 3
+---
+

hugo/content/introduction/features.md

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+---
+title: Features
+weight: 1
+---
+