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tpl: Update Twitter card to also consider images in .Resources

The new lookup order:

1) Page.Params.images if set
2) Image resources: images with name "feature" (priority), "cover", "thumbnail"
3) Site.Params.images if set

Fixes #4349

--- a/tpl/tplimpl/template_embedded.go

+++ b/tpl/tplimpl/template_embedded.go

@@ -231,12 +231,25 @@

 <!-- Facebook Page Admin ID for Domain Insights -->

 {{ with .Site.Social.facebook_admin }}<meta property="fb:admins" content="{{ . }}" />{{ end }}`)

-	t.addInternalTemplate("", "twitter_cards.html", `{{- with $.Param "images" -}}

+	t.addInternalTemplate("", "twitter_cards.html", `{{- with $.Params.images -}}

 <meta name="twitter:card" content="summary_large_image"/>

 <meta name="twitter:image:src" content="{{ index . 0 | absURL }}"/>

 {{ else -}}

+{{- $images := $.Resources.ByType "image" -}}

+{{- $featured := $images.GetMatch "*feature*" -}}

+{{- $featured := cond (ne $featured nil) $featured ($images.GetMatch "{*cover*,*thumbnail*}") -}}

+{{- with $featured -}}

+<meta name="twitter:card" content="summary_large_image"/>

+<meta name="twitter:image:src" content="{{ $featured.Permalink }}"/>

+{{- else -}}

+{{- with $.Site.Params.images -}}

+<meta name="twitter:card" content="summary_large_image"/>

+<meta name="twitter:image:src" content="{{ index . 0 | absURL }}"/>

+{{ else -}}

 <meta name="twitter:card" content="summary"/>

 {{- end -}}

+{{- end -}}

+{{- end }}

 <meta name="twitter:title" content="{{ .Title }}"/>

 <meta name="twitter:description" content="{{ with .Description }}{{ . }}{{ else }}{{if .IsPage}}{{ .Summary }}{{ else }}{{ with .Site.Params.description }}{{ . }}{{ end }}{{ end }}{{ end -}}"/>

 {{ with .Site.Social.twitter -}}

-- 

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