Add dark website and documentation with GitHub Pages deployment

Include the updated desktop screenshot, active-monitor screenshot capture and editor locking, and Settings window drag areas.

site/README.md

@@ -0,0 +1,38 @@
+# Ferese website and handbook
+
+The public site is static HTML and CSS. The handbook is generated from the
+project's Markdown guides, so website and repository documentation stay in sync.
+There are no client frameworks, external fonts, or tracking scripts.
+
+## Local preview
+
+```sh
+python3 -m venv .site-venv
+.site-venv/bin/pip install -r site/requirements.txt
+.site-venv/bin/python scripts/build-site.py
+python3 -m http.server 8080 --bind 127.0.0.1 --directory build/site
+```
+
+Open http://localhost:8080 or http://localhost:8080/docs/. Rebuild after editing
+site sources or Markdown guides, then refresh the browser.
+
+- `site/index.html` and `site/styles.css`: homepage and shared visual design.
+- `site/content/index.md`: handbook introduction.
+- `docs/{installation,configuration,desktop-widgets,notifications}.md`: source guides.
+- `scripts/build-site.py`: renders Markdown, resolves links, generates section
+  navigation, previous/next links, and the search index.
+- `site/app.js`: handbook search and code copying. Reading and navigation work
+  without JavaScript. Search is local to the browser, with no third-party service.
+
+## GitHub Pages
+
+Select **Settings → Pages → Source → GitHub Actions**. The Pages workflow
+publishes site and documentation changes pushed to `main`, or can run manually.
+Expected URL: https://borngraced.github.io/ferese/.
+
+Local links are relative, including documentation search, so publishing under
+the `/ferese/` project path works. Screenshots are copied from `docs/images`
+during the build; the generated `build/site` directory is ignored by Git.
+
+See [GitHub's custom workflow documentation](https://docs.github.com/en/pages/getting-started-with-github-pages/using-custom-workflows-with-github-pages)
+for deployment setup.