docs: Add build and dev instructions

README.md

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+# Moxxy's Website
+
+See the live website at [moxxy.org](https://moxxy.org).
+
+## Development
+
+Developing the site requires [jekyll](https://jekyllrb.com/) and [tailwindcss](https://tailwindcss.com/).
+
+### Jekyll
+
+This website is statically generated using jekyll. Besides jekyll, the two
+jekyll plugins [jekyll-seo-tag](#) and [jekyll-feed](#) must be installed.
+
+See [here](https://jekyllrb.com/docs/plugins/installation/) for instructions
+on installing plugins.
+
+### Tailwind
+
+The website uses tailwindcss for layouting. To use tailwind, install the
+[tailwindcss CLI application](https://tailwindcss.com/docs/installation).
+The [typography plugin](https://tailwindcss.com/docs/typography-plugin) is
+required for building the website.
+
+### Previewing
+
+In order to test changes, assuming jekyll and tailwindcss are set up, ...
+
+1. Run `tailwindcss -c tailwind.config.js -i input.css --watch --output ./_site/assets/css/index.css` from the root of the repository.
+2. Run `jekyll serve` from the root of the repository.
+
+This gives you an environment where tailwindcss and jekyll regenerate their
+previews when modifying their files.
+
+### Building
+
+In order to build the website, you can either use the NixOS flake at the root
+of the repository (`nix build .#website`) or build the website and CSS separately:
+
+1. `jekyll build --future`
+2. `cp -r ./assets _site/assets`
+3. `tailwindcss --input ./input.css --output ./_site/assets/css/index.css`
+
+## License
+
+See [`./LICENSE`](./LICENSE)