message: ci: add CI check so it appears in screenshots
diff: @@ -89,6 +89,7 @@ const app = createApp({
  template: `
  <div id="app">
  <h1>Transitions</h1>
  + <pre>CI: ${__CI__}</pre>
  <ul>
  <li><router-link to="/">/</router-link></li>
  <li><router-link to="/parent">/parent</router-link></li>
  