images, deterministic caching

layouts/_default/_markup/render-image.html

@@ -0,0 +1,7 @@
+{{ $hook_ctx := . }}
+{{ with .Page.Resources.Get .Destination | resources.Copy (replaceRE "([^/]*)$" "_$1" (path.Join .Page.Path .Destination)) | fingerprint }}
+<figure>
+  <a href="{{ .RelPermalink }}"><img src="{{ .RelPermalink }}"></a>
+  {{- with $hook_ctx.Text }}<figcaption>{{ . }}</figcaption>{{ end -}}
+</figure>
+{{ end }}