feat(shortcode): revert to `img` SVGs

Cacheable, zoomable, and lazily loaded.

Also, prevents conflicts if admin attempts to include multiple inline SVGs which unintentionally reuse each other's components.

wowchemy/assets/scss/wowchemy/_base.scss

@@ -241,8 +241,7 @@ figure {
   justify-content: center;
 }
 
-figure img,
-figure svg {
+figure img {
   height: auto;
   max-width: 100%;
   flex-basis: 100%;

wowchemy/layouts/shortcodes/figure.html

@@ -16,7 +16,11 @@
   {{- if $img -}}
     {{ $isSVG := eq $img.MediaType.SubType "svg" }}
     {{ if $isSVG }}
-      {{ $img.Content | safeHTML }}
+      <img alt="{{ $alt }}"
+       src="{{ $img.RelPermalink }}"
+       loading="lazy"
+       data-zoomable
+       {{ with .Get "width" }}width="{{.}}"{{end}} {{ with .Get "height" }}height="{{.}}"{{end}} />
     {{ else }}
       {{- $img_lg := $img.Fit "1200x1200" -}}
       {{- $img_md := $img_lg.Fit "760x760" -}}{{/* Match `.docs-article-container` max-width */}}