Add more theme stuff, add a smidge of content

public/css/bootstrap/site/layouts/_default/_markup/render-heading.html

@@ -0,0 +1,7 @@
+{{- $id := .Anchor | safeURL -}}
+{{- $text := .Text | safeHTML -}}
+<h{{ .Level }} id="{{ $id }}">{{ $text }}
+{{- if and (ge .Level .Page.Site.Params.anchors.min) (le .Level .Page.Site.Params.anchors.max) }}{{" " -}}
+<a class="anchor-link" href="#{{ $id }}" aria-label="Link to this section: {{ $text }}"></a>
+{{- end -}}
+</h{{ .Level }}>

public/css/bootstrap/site/layouts/_default/_markup/render-image.html

@@ -0,0 +1,8 @@
+{{- $originalSrc := .Destination | safeURL -}}
+{{- $localImgPath := path.Join "/site/static/docs" site.Params.docs_version $originalSrc -}}
+{{- /* This shouldn't be needed but we have a weird folder structure with version included... */ -}}
+{{- $src := urls.JoinPath "/docs" site.Params.docs_version $originalSrc -}}
+{{- $config := imageConfig $localImgPath -}}
+{{- $classes := "d-block img-fluid" -}}
+
+<img src="{{ $src }}" class="{{ $classes }}" alt="{{ .Text }}" width="{{ $config.Width }}" height="{{ $config.Height }}" loading="lazy">