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Improve the twitter card template

Now fall back to `images` set in site config for twitter card.

Fixes #3711

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

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

@@ -231,23 +231,22 @@

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

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

-	t.addInternalTemplate("", "twitter_cards.html", `{{ if .IsPage }}

-{{ with .Params.images }}

-<!-- Twitter summary card with large image must be at least 280x150px -->

-  <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 }}

-

-<!-- Twitter Card data -->

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

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

 <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 }}<meta name="twitter:site" content="@{{ . }}"/>{{ end }}

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

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

+<meta name="twitter:site" content="@{{ . }}"/>

+{{ end -}}

 {{ range .Site.Authors }}

-  {{ with .twitter }}<meta name="twitter:creator" content="@{{ . }}"/>{{ end }}

-{{ end }}{{ end }}`)

+{{ with .twitter -}}

+<meta name="twitter:creator" content="@{{ . }}"/>

+{{ end -}}

+{{ end -}}`)

 	t.addInternalTemplate("", "google_news.html", `{{ if .IsPage }}{{ with .Params.news_keywords }}

   <meta name="news_keywords" content="{{ range $i, $kw := first 10 . }}{{ if $i }},{{ end }}{{ $kw }}{{ end }}" />

-- 

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