message: removed old login in storybook examples
diff: <meta charset='UTF-8'>
  <title>solid-ui UI.widgets.header examples page</title>
  <script type="text/javascript" src="../../lib/webpack-bundle.js"></script>
  - <script src="https://solid.github.io/solid-auth-client/dist/solid-auth-client.bundle.js"></script>
  + <script type="text/javascript" src="../../lib/authn/authn.js"></script>
  <script>
  const $ = document.querySelector.bind(document)
  function showSource(widgetName) {
  .replace(/'/g, "&#039;")
  }
  </script>
  - <style>
  - .loginButton {
  - border-radius: 0.2em;
  - margin: 1em;
  - font-size: 85%;
  - background-color: #fff;
  - border-style: .01em solid #7C4DFF;
  - color: #7C4DFF;
  - }
  -
  - .loginButton:hover {
  - background-color: #7C4DFF;
  - color: #fff;
  - }
  - </style>
  </head>
  <body>
  <h2 id="header"><a href="#header">Header</a>
  - <button class="loginButton" onclick="login('https://solidcommunity.net')">Login</button>
  + <div id="webId"></div>
  + <div id="loginBanner"></div>
  <script>
  - async function login(idp) {
  - const session = await solid.auth.currentSession();
  - if (!session)
  - await solid.auth.login(idp);
  + loginBanner.appendChild(authn.loginStatusBox(document, null, {}));
  +
  + async function finishLogin() {
  + await authn.authSession.handleIncomingRedirect();
  + const session = authn.authSession;
  + if (session.info.isLoggedIn) {
  + // Update the page with the status.
  + webId.innerHTML = "Logged in as: " + authn.currentUser().uri;
  + } else {
  + webId.innerHTML = "";
  + }
  }
  +
  + finishLogin();
  </script>
  </h2>
  <p>This example demonstrates how to use the header component. The header has a different view depending
  