Move render hook examples to example dir to avoid Hugo warnings.

layouts/markup_examples/README.md

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+Move wanted render hook file to the project `layout/_markup` directory to activate.

layouts/markup_examples/render-codeblock.html

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+{{ .Page.Store.Set "codeblocks" true -}}
+{{ $result := transform.HighlightCodeBlock . -}}
+<div data-codeblock itemscope itemtype="https://schema.org/SoftwareSourceCode" {{ range $k, $v := .Attributes }}{{ printf " %s=%q" $k $v | safeHTMLAttr }}{{ end }}>
+<button data-codebutton class="codebutton" title="{{ i18n "copy_code" }}"><span>⧉</span></button>
+<meta itemprop="codeSampleType" content="snippet">
+<meta data-codetext itemprop="text" content="{{ .Inner | jsonify }}">
+{{ if .Type -}}
+<meta itemprop="programmingLanguage" content="{{ .Type }}">
+<pre tabindex="0" class="chroma">
+<code class="language-{{ .Type }}" data-lang="{{ .Type }}">{{ $result.Inner }}</code>
+</pre>
+{{ else -}}
+{{ $result.Wrapped }}
+{{ end -}}
+</div>

layouts/markup_examples/render-heading.html

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+<div class="anchor">
+<h{{ .Level }} id="{{ .Anchor | safeURL }}" {{ range $k, $v := .Attributes }}{{ printf " %s=%q" $k $v | safeHTMLAttr }}{{ end }}>
+{{- .Text | safeHTML -}}
+</h{{ .Level }}>
+<a class="" href="#{{ .Anchor | safeURL }}" aria-label="{{ i18n "string_permalink" }}: {{ .Text | safeHTML }}">
+  <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
+  <path stroke="none" d="M0 0h24v24H0z" fill="none" />
+  <path d="M10 14a3.5 3.5 0 0 0 5 0l4 -4a3.5 3.5 0 0 0 -5 -5l-.5 .5" />
+  <path d="M14 10a3.5 3.5 0 0 0 -5 0l-4 4a3.5 3.5 0 0 0 5 5l.5 -.5" />
+  </svg>
+</a>
+</div>

layouts/markup_examples/render-image.html

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+{{/* Control how the image is rendered with these variables.  */}}
+{{ $class := "" -}}
+{{ $size := "" -}}
+{{ $srcset := "" -}}
+{{ $width := "" -}}
+
+{{/* Only change the below code if you know what you are doing. */}}
+{{ $height := "" -}}
+{{ $maxwidth := site.Params.imageMaxWidth -}}
+{{ $realwidth := 0 -}}
+{{ $realheight := 0 -}}
+{{ $resource := false -}}
+{{ $src := .Destination -}}
+{{ $srcsetw := (slice) -}}
+{{ $static := false -}}
+
+{{ if and $src (fileExists (path.Join "/static" $src)) -}}
+  {{ with (imageConfig (path.Join "/static" $src)) -}}
+    {{ $realwidth = .Width -}}
+    {{ $realheight = .Height -}}
+  {{ end -}}
+  {{ $static = true -}}
+  {{ $src = relURL $src -}}
+{{ else if $src -}}
+  {{ $src = strings.TrimLeft "/" $src -}}
+  {{ with resources.Get $src -}}
+    {{ $resource = . -}}
+  {{ end -}}
+  {{ with .Page.Resources.Get $src -}}
+    {{ $resource = . -}}
+  {{ end -}}
+{{ end -}}
+
+{{ if $resource -}}
+  {{ if $size -}}
+    {{ $image := $resource.Resize $size -}}
+    {{ $src = $image.RelPermalink -}}
+    {{ $width = $image.Width -}}
+    {{ $height = $image.Height -}}
+    {{ if $srcset -}}
+      {{ $srcsetw = $srcsetw | append (printf "%s %sw" $src (strings.TrimRight "x" $size)) -}}
+    {{ end -}}
+  {{ else -}}
+    {{ $src = $resource.RelPermalink -}}
+    {{ $realwidth = $resource.Width -}}
+    {{ $realheight = $resource.Height -}}
+  {{ end -}}
+  {{ if $srcset -}}
+    {{ range $set := split $srcset " " -}}
+      {{ $image := $resource.Resize (printf "%sx" $set) -}}
+      {{ $srcsetw = $srcsetw | append (printf "%s %sw" $image.RelPermalink $set) -}}
+    {{ end -}}
+    {{ $width = "" -}}
+    {{ $height = "" -}}
+  {{ end -}}
+{{ end -}}
+
+{{ if and $width $height -}}
+    {{ $width = int $width -}}
+    {{ $height = int $height -}}
+{{ else if $width -}}
+  {{ $width = int $width -}}
+  {{ $height = $realheight -}}
+  {{ if and ($realwidth) (lt ($width) ($realwidth)) -}}
+    {{ $height = (mul ($realheight) (div (add ($width) 0.0) ($realwidth))) -}}
+    {{ $height = (math.Round $height) -}}
+  {{ end -}}
+{{ else if $height -}}
+  {{ $width = $realwidth -}}
+  {{ $height = int $height -}}
+  {{ if and ($realheight) (lt ($height) ($realheight)) -}}
+    {{ $width = (mul ($realwidth) (div (add ($height) 0.0) ($realheight))) -}}
+    {{ $width = (math.Round $width) -}}
+  {{ end -}}
+{{ else if and ($maxwidth) (lt ($maxwidth) ($realwidth)) -}}
+  {{ $width = ($maxwidth) -}}
+  {{ $height = (mul ($realheight) (div (add ($width) 0.0) ($realwidth))) -}}
+  {{ $height = (math.Round $height) -}}
+{{ end -}}
+
+<img class="image{{ with $class }} {{ . }}{{ end }}" src="{{ $src }}" alt="{{ .Text }}"{{ with $srcsetw }} srcset="{{ delimit  .  ", " }}"{{ end }}{{ with $width }} width="{{ . }}"{{ end }}{{ with $height }} height="{{ . }}"{{ end }}{{ with .Title}} title="{{ . }}"{{ end }}>
+{{- /* chomp trailing newline */ -}}

layouts/markup_examples/render-link.html

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+<a href="{{ .Destination | safeURL }}"{{ with .Title}} title="{{ . }}"{{ end }}{{ if strings.HasPrefix .Destination "http" }} target="_blank" rel="noopener noreferrer"{{ end }}>{{ .Text | safeHTML }}</a>
+{{- /* chomp trailing newline */ -}}