pelican-alchemy/alchemy/templates/header.html

<div id="header">
  <div class="container">
    <div class="row">
      <div class="col-sm-4">
        <a class="site-logo" href="{{ SITEURL }}" title="{{ SITENAME|striptags }}">
          <img class="img-responsive" src="{{ PROFILE_IMAGE_URL }}">
        </a>
      </div>
    </div>
  </div>
</div>