initial support for img (later vid) and its attributes...

layouts/_default/_markup/render-image.html

@@ -5,7 +5,12 @@
   {{ $_.Add "triads" $k }}
 {{- end -}}
 
-{{- if strings.HasPrefix .Destination "bib:" -}}
+{{- if strings.HasPrefix .Destination "img:" -}}
+  {{- $img_params := (substr .Destination 4) -}}
+  {{- $img_src := index (split $img_params " ") 0 -}}
+  {{- $img_attr := index (split $img_params $img_src) 1 -}}
+  <img src="{{ $img_src }}" {{ $img_attr | safeHTMLAttr }} />
+{{- else if strings.HasPrefix .Destination "bib:" -}}
   {{- $destination := (substr .Destination 4) -}}
   {{- $c_prefix := .Page.Site.Params.sandpointsCatalogPrefix | default "/library/" -}}
   {{- if index $.Page.Site.Data.books.catalog $destination -}}