message: Use object for configuring CSS plugin
diff: import textLoader from "../loaders/text.js";
  import { postcss, postcssImport, postcssNesting } from "../deps/postcss.js";
  -export default function (plugins = []) {
  +export default function ({ postcssPlugins = [] }) {
  return (site) => {
  const runner = postcss([
  postcssImport({
  path: site.src("_includes"),
  }),
  postcssNesting(),
  - ...plugins,
  + ...postcssPlugins,
  ]);
  site.loadAssets([".css"], textLoader);
  