Add README with dev setup, build, and deployment docs

README.md

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+# openvoxproject.org
+
+The [OpenVox](https://openvoxproject.org) website — a static marketing site built with
+[Jekyll](https://jekyllrb.com/) for page templates/content and [Vite](https://vite.dev/) for JS/CSS bundling,
+on top of the [`@openvoxproject/voxblocks`](https://www.npmjs.com/package/@openvoxproject/voxblocks) web
+component library.
+
+## Local development
+
+Prerequisites: Node.js 26+ and Ruby 3.4+ with Bundler.
+
+```console
+npm install
+bundle install
+npm run dev
+```
+
+`npm run dev` runs Vite in watch mode and `jekyll serve --livereload` concurrently; the site is served at
+<http://localhost:4000>.
+
+If you don't have Node or Ruby installed, you can still build and view the site with only Docker (no
+livereload — rebuild the image to see changes) using the commands under [Deployment](#deployment).
+
+## Building
+
+Vite must run before Jekyll — it bundles `src/` into `assets/` and writes `_data/manifest.json`, which the
+default layout uses to look up hashed asset filenames:
+
+```console
+npm run build
+bundle exec jekyll build
+```
+
+The finished site lands in `_site/`.
+
+## Project layout
+
+- `index.html`, `products.html`, etc. — Jekyll pages using the `default` layout
+- `_products/` — one Markdown file per product, rendered as cards and pages from its front matter plus its
+  Markdown body (the body becomes the card text and the product page's hero description). To add a product,
+  copy an entire existing file (e.g. `_products/openvox.md`) to a new `_products/*.md` and edit both the
+  front matter and the body; no template changes needed.
+- `src/` — JS and CSS bundled by Vite (`main.js` imports voxblocks components as a side effect)
+- `_layouts/`, `_includes/` — Jekyll templates
+
+## Deployment
+
+Pushes to `main` deploy to GitHub Pages via [deploy.yml](.github/workflows/deploy.yml). A multi-stage
+[Dockerfile](Dockerfile) (Node → Jekyll → nginx, serving on port 8080) is also built and published to
+ghcr.io by [docker-publish.yml](.github/workflows/docker-publish.yml) on pushes to `main` and `v*.*.*` tags:
+
+```console
+docker build -t openvox-site .
+docker run -p 8080:8080 openvox-site
+```