Fix image resizing quality (chainguard-dev#1504)

Fixes chainguard-dev/internal#3646

## Type of change
<!-- Please be sure to add the appropriate label to your PR. -->

### What should this PR do?
- This PR brings in doks' image rendering hook at v0.4.3 here:
https://github.com/gethyas/doks/blob/cf51ea887dd12f79588f950988d0eb6c6895407f/layouts/_default/_markup/render-image.html
- With the modification of using `Lanczos` resampling filter ([Hugo
docs](https://gohugo.io/content-management/image-processing/#resampling-filter))

Signed-off-by: Garry Ing <[email protected]>

layouts/_default/_markup/render-image.html

@@ -0,0 +1,36 @@
+{{ $image := "" -}}
+{{ if (urls.Parse .Destination).IsAbs }}
+  {{ $image = resources.GetRemote .Destination -}}
+{{ else -}}
+  {{ $image = .Page.Resources.GetMatch .Destination -}}
+{{ end -}}
+{{ with $image -}}
+  {{ $lqip := $image.Resize site.Params.lqipWidth -}}
+
+  {{ $imgSrc := "" -}}
+  {{ $imgSrcSet := slice -}}
+
+  {{ $widths := site.Params.landscapePhotoWidths -}}
+  {{ if gt $image.Height $image.Width -}}
+    {{ $widths = site.Params.portraitPhotoWidths -}}
+  {{ end -}}
+
+  {{ range $widths -}}
+    {{ $srcUrl := (printf "%dx Lanczos" . | $image.Resize).Permalink -}}
+    {{ if eq $imgSrc "" -}}{{ $imgSrc = $srcUrl -}}{{ end -}}
+    {{ $imgSrcSet = $imgSrcSet | append (printf "%s %dw" $srcUrl .) -}}
+  {{ end -}}
+  {{ $imgSrcSet = (delimit $imgSrcSet ",") -}}
+
+  {{ if gt $image.Width site.Params.smallLimit -}}
+    <figure class="figure">
+      <img class="figure-img img-fluid lazyload blur-up" data-sizes="auto" src="{{ $lqip.Permalink }}" data-srcset="{{ $imgSrcSet }}" width="{{ $image.Width }}" height="{{ $image.Height }}" alt="{{ $.Text }}">
+      <noscript><img class="figure-img img-fluid" sizes="100vw" srcset="{{ $imgSrcSet }}" src="{{ $image.Permalink }}" width="{{ $image.Width }}" height="{{ $image.Height }}" alt="{{ $.Text }}"></noscript>
+      {{ with $.Title }}<figcaption class="figure-caption">{{ . | safeHTML }}</figcaption>{{ end -}}
+    </figure>
+  {{ else -}}
+    <img class="img-fluid lazyload blur-up" src="{{ $lqip.Permalink }}" data-src="{{ $image.Permalink }}" width="{{ $image.Width }}" height="{{ $image.Height }}" alt="{{ $.Text }}">
+  {{ end -}}
+{{ else -}}
+  {{ erroridf "image-not-found" "Image not found" -}}
+{{ end -}}