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

<a href="{{ .Destination | safeURL }}"
    {{- with .Title -}}
    title="{{ . }}"
    {{- end }}
    {{- if or (strings.HasPrefix .Destination "http:") (strings.HasPrefix .Destination "https:") }} target="_blank"{{ end }}>
    {{- .Text | safeHTML -}}
</a>