Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

```
git subtree add --prefix=docs/ https://github.com/gohugoio/hugoDocs.git master --squash
```

Closes #11925

docs/content/en/hugo-modules/_index.md

@@ -0,0 +1,29 @@
+---
+title: Hugo Modules
+linkTitle: Overview
+description: How to use Hugo Modules.
+categories: []
+keywords: []
+menu:
+  docs:
+    identifier: hugo-modules-overview
+    parent: modules
+    weight: 10
+weight: 10
+toc: true
+aliases: [/themes/overview/,/themes/]
+---
+
+**Hugo Modules** are the core building blocks in Hugo. A _module_ can be your main project or a smaller module providing one or more of the 7 component types defined in Hugo: **static**, **content**, **layouts**, **data**, **assets**, **i18n**, and **archetypes**.
+
+You can combine modules in any combination you like, and even mount directories from non-Hugo projects, forming a big, virtual union file system.
+
+Hugo Modules are powered by Go Modules. For more information about Go Modules, see:
+
+- [https://github.com/golang/go/wiki/Modules](https://github.com/golang/go/wiki/Modules)
+- [https://go.dev/blog/using-go-modules](https://go.dev/blog/using-go-modules)
+
+Some example projects:
+
+- [https://github.com/bep/docuapi](https://github.com/bep/docuapi) is a theme that has been ported to Hugo Modules while testing this feature. It is a good example of a non-Hugo-project mounted into Hugo’s folder structure. It even shows a JS Bundler implementation in regular Go templates.
+- [https://github.com/bep/my-modular-site](https://github.com/bep/my-modular-site) is a very simple site used for testing.