fix(layouts): use comma for more than 2 contributors
This makes the byline show commas on all but the last author of a blog post.
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@ -1 +1,2 @@
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<p><small>Posted {{ .PublishDate.Format "January 2, 2006" }} by {{ if .Params.contributors -}}{{ range $index, $contributor := .Params.contributors }}{{ if gt $index 0 }} and {{ end }}<a class="stretched-link position-relative" href="{{ "/contributors/" | relURL }}{{ . | urlize }}/">{{ . }}</a>{{ end -}}{{ end -}} ‐ <strong>{{ .ReadingTime -}} min read</strong></small><p>
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{{ $last := sub (len .Params.contributors) 1 }}
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<p><small>Posted {{ .PublishDate.Format "January 2, 2006" }} by {{ if .Params.contributors -}}{{ range $index, $contributor := .Params.contributors }}{{ if gt $index 0 }}{{ if eq $index $last }} and {{ else }}, {{ end }}{{ end }}<a class="stretched-link position-relative" href="{{ "/contributors/" | relURL }}{{ . | urlize }}/">{{ . }}</a>{{ end -}}{{ end -}} ‐ <strong>{{ .ReadingTime -}} min read</strong></small><p>
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