Omphaloskepsis-2/layouts/partials/header/site-nav.html

<nav class="site-header__nav">
  <ul>
    {{ range ( where .Site.Sections.ByTitle "Type" "in" site.Params.mainSections ) }}
    <a href="{{ .RelPermalink }}"><li>{{ .Title | safeHTML }}</li></a>
    {{ end }}
  </ul>
</nav>