Add the website recipe

recipes/web/website/recipe.toml

+[source]
+git = "https://gitlab.redox-os.org/redox-os/website"
+[build]
+template = "custom"
+script = """
+./hugo.sh
+mkdir -pv "${COOKBOOK_STAGE}"/usr/share/website
+cp -rv "${COOKBOOK_BUILD}"/build/public/* "${COOKBOOK_STAGE}"/usr/share/website
+"""