Modify embedded figure shortcode to look for page resource

[jmooring]

Reference: #12244

With a shared page resource (e.g., image) on a multilingual single-host site, we do not (by default) duplicate the resource for each language, as designed. In this configuration we automatically enable an embedded image render hook to handle markdown destinations, but the embedded figure shortcode does not use the same logic, resulting in broken images.

We need to do this:

  {{- $u := urls.Parse (.Get "src") -}}
  {{- $src := $u.String -}}
  {{- if not $u.IsAbs -}}
    {{- with or (.Page.Resources.Get $u.Path) (resources.Get $u.Path) -}}
      {{- $src = .RelPermalink -}}
    {{- end -}}
  {{- end -}}

This should be safe regardless of site configuration. We're not touching external destinations, and we fall back to the original value if we can't find a page resource or global resource.

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