fx-file-server/hugo/docsy/layouts/_partials/navbar-version-selector.html

<div class="dropdown">
  <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    {{- .Site.Params.version_menu -}}
  </a>
  <ul class="dropdown-menu">
    {{ $path := "" -}}
    {{ if .Site.Params.version_menu_pagelinks -}}
      {{ $path = .Page.RelPermalink -}}
    {{ end -}}
    {{ range .Site.Params.versions -}}
    <li><a class="dropdown-item" href="{{ .url }}{{ $path }}">{{ .version }}</a></li>
    {{ end -}}
  </ul>
</div>