congo/layouts/_default/_markup/render-image.html

{{ $url := urls.Parse .Destination }}
{{ $altText := .Text }}
{{ $caption := .Title }}
{{ $class := "mx-auto my-0 rounded-md" }}

{{ $file := $url.Path }}
{{ $img := .Page.Resources.GetMatch $file }}
{{- if and (not $img) .Page.File }}
  {{ $path := path.Join .Page.File.Dir $file }}
  {{ $img = resources.Get $path }}
{{ end -}}

{{/* https://github.com/gohugoio/hugo/pull/10666 */}}
{{- $params := $url.Query -}}
{{- $x2Param := $params.Get "2x" -}}
{{- $x2 := false -}}
{{- if eq $x2Param "true" -}}
  {{- $x2 = true -}}
{{- end -}}

<figure>
  {{- with $img -}}
    {{ partial "picture.html" (dict "img" . "alt" $altText "class" $class "x2" $x2) }}
  {{- else -}}
    <img src="{{ .Destination | safeURL }}" alt="{{ $altText }}" class="{{ $class }}" />
  {{- end -}}
  {{ with $caption }}<figcaption class="text-center">{{ . | markdownify }}</figcaption>{{ end }}
</figure>