Big documentation rewrite, move docs to example site

exampleSite/content.en/docs/introduction.md

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+---
+weight: 10
+---
+# Introduction
+
+Hugo Book is a documentation theme for [Hugo](https://gohugo.io). It provides a clean, readable layout for technical docs with minimal dependencies and no build tooling beyond Hugo itself.
+
+## Design Goals
+
+Minimalism over features.
+: The theme ships only what most documentation sites need: a sidebar menu, search, and a few shortcodes. There is no attempt to cover every use case. CSS is written by hand, not generated by a framework. JavaScript is optional for core navigation.
+
+Theme as an extendable base.
+: Hugo Book is meant to be extended and adapted. 'Inject' partials, custom SCSS, and Hugo's template override system let you change any part of the theme without modifying the source, while keeping the codebase intentionally small.
+
+Long-term maintainability.
+: Few dependencies means fewer things to break. The theme avoids heavy JavaScript libraries, CSS frameworks, and complex build pipelines.
+
+[Get Started](/docs/getting-started/)
+
+## Links
+- [Source code](https://github.com/alex-shpak/hugo-book)
+- [Hugo documentation](https://gohugo.io/documentation/)