chore: import upstream snapshot with attribution

doc/devdocs-website/README.md

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+# Dev Docs Website
+
+This folder hosts the [docmd](https://docmd.io/) project that turns the PowerToys developer
+documentation in [`doc/devdocs`](../devdocs) into a static website.
+
+## Generated site
+
+The `site/` folder is the docmd build output. It is **not committed** to the repository — it is
+git-ignored and rebuilt on demand. You only need it locally when previewing your changes (see below).
+
+Publishing is handled by the
+[Publish Dev Docs Website](../../.github/workflows/regenerate-devdocs-website.yml) GitHub Action, which
+runs whenever files under `doc/devdocs` (or this folder) change on the `main` branch — it can also
+be triggered manually from the **Actions** tab. The action builds the site and deploys it straight to
+GitHub Pages as an artifact, so nothing is written back to the repository.
+
+> [!NOTE]
+> The action requires GitHub Pages to be enabled with **Source: GitHub Actions** under the repository
+> **Settings → Pages**.
+
+## Editing the docs
+
+To change the documentation, edit the Markdown files under [`doc/devdocs`](../devdocs). The remaining
+files in this folder are maintained by hand and are safe to edit:
+
+- `docmd.config.json` — docmd configuration (title, source, output, plugins)
+- `package.json` — pins the docmd version used to build the site
+- `docmd-plugins/` — local build-time docmd plugins
+
+> [!TIP]
+> Link to repository files with repo-root-relative paths such as `/src/modules/.../Foo.cpp`.
+> VS Code resolves these against the workspace root (so they open the local file), and the
+> bundled `github-source-links` plugin rewrites them to
+> `https://github.com/microsoft/PowerToys/blob/main/...` on the published site.
+
+## Building locally
+
+Requires [Node.js](https://nodejs.org/).
+
+```powershell
+npm install      # install dependencies (first time only)
+npm run dev      # start a local preview server at http://localhost:3000
+npm run build    # generate the static site into ./site
+```