Simplify heading rendering

layouts/_default/_markup/render-heading.html

@@ -0,0 +1 @@
+<h{{ .Level }} id="{{ .Anchor | safeURL }}">{{ .Text | safeHTML }} <a href="#{{ .Anchor | safeURL }}" class="anchor" aria-hidden="true">#</a></h{{ .Level }}>

layouts/docs/single.html

@@ -31,7 +31,7 @@
 				{{ partial "sidebar/docs-toc.html" . }}
 			</nav>
 			{{ end -}}
-			{{ partial "main/headline-hash.html" .Content }}
+			{{ .Content }}
 			{{ if .Site.Params.editPage -}}
 				{{ partial "main/edit-page.html" . }}
 			{{ end -}}

layouts/partials/main/headline-hash.html

@@ -1 +0,0 @@
-{{ . | replaceRE "(<h[2-9] id=\"([^\"]+)\".+)(</h[2-9]+>)" `${1}<a href="#${2}" class="anchor" aria-hidden="true">#</a> ${3}` | safeHTML }}