message: docs: Add favicon to docs in vitepress config
diff: /** @typedef {import('vitepress').UserConfig} UserConfig */
  /** @type {UserConfig['head']} */
  -const head = []
  +const head = [['link', { rel: 'icon', href: `/logo.png` }]]
  if (process.env.NODE_ENV === 'production') {
  head.push([
  