title: How to create dynamic route for top-level page in NEXT?
body: <p>To support these URLs:</p>
  <ul>
  <li><code>/account?tab=profile</code></li>
  <li><code>/account?tab=pass</code></li>
  <li><code>/account?tab=points</code></li>
  </ul>
  <p>I know that I can change them to:</p>
  <ul>
  <li><code>/account/profile</code></li>
  <li><code>/account/pass</code></li>
  <li><code>/account/points</code></li>
  </ul>
  <p>And then create this route:</p>
  <p><code>/pages/account/[tab].js</code></p>
  <p>But this means that the <code>accoun</code> is a directory, not a file.</p>
  <p>I want to have a <code>account.js</code> top-level file, and have a route for query strings on it.</p>
  <p>I don't know how to do it. Something like <code>/account?[tab]</code> route. Is it possible?</p>