redstrate.com/themes/red/layouts/partials/featured-art.html

<div class="gallery-con">
{{ with .Site.GetPage "/art" }}
    {{ range .Param "featured" }}
    <figure class="gallery-fig">
        {{ $filename_without_ext := strings.TrimSuffix (path.Ext .filename) .filename }}

        {{ $month := "1" }}
        {{ $year := "1" }}

        {{ if .date }}
            {{ $split := split .date "-" }}
            {{ $month = index $split 1 }}
            {{ $year = index $split 0 }}
        {{ end }}

        {{ $use_newformat := false }}
        {{ if ge (int $year) 2023 }}
                {{ $use_newformat = true }}
        {{ end }}

        {{ $path := printf "/art/%s/%s/%s" $year $month $filename_without_ext}}

        <a href="{{ $path }}" aria-label="Click to view details {{ $year }}" class="no-decoration">
            {{ $title := .title }}

            {{ if $use_newformat }}
                    {{ $full := printf "https://images.redstrate.com/thumb/%s.avif" $filename_without_ext }}
                    {{ $jpeg := printf "https://images.redstrate.com/thumb/%s.jpg" $filename_without_ext }}

                    <picture>
                        <source srcset="{{ $full }}" type="image/avif"/>
                        <img class="gallery-img featured-art" alt="{{ $title }}" src="{{ $jpeg }}">
                    </picture>
            {{ else }}
                {{ with resources.Get (printf "art/%s" .filename) }}
                {{ $image := .Resize "500x" }}
                <img class="gallery-img featured-art" alt="{{ $title }}" width="{{ $image.Width }}" height="{{ $image.Height }}" src="{{ $image.RelPermalink }}">
                {{ else }}
                <p>Thumbnail not found!</p>
                {{ end }}
            {{ end }}
        </a>

        <figcaption>
            {{ with .title }}
                <i>"{{ . }}"</i>
            {{ end }}
        </figcaption>
    </figure>
    {{ end }}
{{ end }}
</div>