congo/layouts/_default/_markup/render-link.html

{{ $link := .Destination }}
{{ $isRemote := strings.HasPrefix $link "http" }}
{{- if not $isRemote }}
  {{ $url := urls.Parse .Destination }}
  {{- if $url.Path }}
    {{ $fragment := "" }}
    {{- with $url.Fragment }}{{ $fragment = printf "#%s" . }}{{ end -}}
    {{- with .Page.GetPage $url.Path }}
      {{ $link = printf "%s%s" .RelPermalink $fragment }}
    {{ else }}
      {{- if hasSuffix $url.Path ".md" }}
        {{ warnf "Can't resolve: %s" .Destination }}
      {{ end -}}
    {{ end -}}
  {{ end -}}
{{ end -}}
<a href="{{ $link | safeURL }}"{{ with .Title }} title="{{ . }}"{{ end }}{{ if $isRemote }} target="_blank" rel="noreferrer"{{ end }}>{{- .Text | safeHTML -}}</a>