message: Remove logo markup from login form
diff: <form action="{{ action }}" method="post">
  - {{#if logoUrl}}
  - <!-- show app logo -->
  - <fieldset><img src={{logoUrl}} style="max-width: 100%"/></fieldset>
  - {{#else}}
  -
  - <!-- show curveball logo -->
  - <fieldset style="background: #1e88e5;">
  - <img src="https://curveballjs.org/assets/images/logo.svg" style="max-width: 100%"/>
  - </fieldset>
  - {{/else}}
  - {{/if}}
  -
  {{# if msg}}
  <div class="msg info">{{ msg }}</div>
  {{/if}}
  