hugo-theme-relearn/layouts/partials/menu.html

<nav id="sidebar">
  <div id="header-wrapper">
    <div id="header">
      {{ partial "logo.html" . }}
      {{ if .Site.Params.search }}
      <div class="searchbox">
        <label for="search-by"><i class="fa fa-search"></i></label>
        <input id="search-by" type="text" placeholder="Search Documentation" data-search-input="/lunr.json/query">
        <span data-search-clear=""><i class="fa fa-close"></i></span>
      </div>
      {{ end }}
    </div>
</div>


  <div class="highlightable">
    <ul class="topics">
      {{ $page := . }}
      {{ range $key , $value := .Site.Sections }}
      {{ if ne $key "" }}
      {{ $first := (index $value 0).Page }}

      <li class="dd-item {{ if eq $page.RelPermalink $first.RelPermalink }}active{{ end }} {{if in $page.RelPermalink $first.RelPermalink }}parent{{ end }}" data-nav-id="{{ $first.RelPermalink }}">
        <a href="{{ $first.RelPermalink }}">
          <span>
            {{ if isset $first.Params "icon" }}
              {{ printf $first.Params.icon | safeHTML }}
            {{ end }}
             {{ $first.Title }}
           </span>
        </a>
        {{ if gt .Pages.Len 1}}
        <ul>
          {{ range $k, $p := .Pages }}
          {{ if gt $k 0 }}
            <li class="dd-item {{ if eq $page.RelPermalink $p.RelPermalink }}active{{ end }}" data-nav-id="{{ $p.RelPermalink }}">
              <a href="{{ $p.RelPermalink }}">
                <span>{{ $p.Title }}</span>
              </a>
            </li>
          {{ end }}
          {{ end }}
        </ul>
        {{ end }}
      </li>
      {{ end }}
      {{ end }}
    </ul>
    <hr>
    <section id="footer">
      <p>Built with <a href="https://github.com/matcornic/hugo-theme-learn"><i class="fa fa-heart"></i></a> from <a href="http://getgrav.org">Grav</a> and <a href="http://gohugo.io/">Hugo</a></p>
    </section>
  </div>
</nav>