Treat the links in the footer as external. (#796)

Simon Hollingshead

09.20.2023 7627f13a1a8fe5521a3e534ad0c5f3cfcba99b68

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<li>
  <span class="date">{{ .Date | time.Format (.Site.Params.dateFormat | default "January 2, 2006" ) }}</span>
  <a class="title" href="{{ .Params.externalLink | default .RelPermalink }}">{{ .Title }}</a>
</li>