Add link to original image to blogPhoto shortcode

We might decide to link to still slightly compressed version, but this
currently works fine.

themes/patek/layouts/shortcodes/blogPhoto.html

@@ -46,6 +46,6 @@ where possible named params are:
 {{- end -}}
 
 <figure>
-    <img src="{{ $largest.RelPermalink }}" alt="{{ $alt }}" srcset="{{ delimit $srcset ", " }}">
+    <a href="{{ $img.RelPermalink }}"><img src="{{ $largest.RelPermalink }}" alt="{{ $alt }}" srcset="{{ delimit $srcset ", " }}"></a>
     {{ if (ne $caption false) }}<figcaption>{{ $caption }}</figcaption>{{ end }}
 </figure>