Add support for TOC partial.

README.adoc

@@ -7,6 +7,7 @@
 :uri-opengraph: http://ogp.me/
 :uri-schema: https://schema.org/
 :uri-twittercards: https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/abouts-cards.html
+:uri-hugo-doc-toc: https://gohugo.io/content-management/toc
 :uri-tomorrow-pygments: https://github.com/mozmorris/tomorrow-pygments
 
 *nocolor* is a link:{uri-hugo}[Hugo] theme with no predefined colors and minimal
@@ -40,6 +41,9 @@ template `extra-head.html` or above the footer by overwriting
 `layouts/partials/extra_head.html` or `layouts/partials/extra_foot.html`,
 respectively.
 
+To add a TOC to your pages, add `layouts/partials/toc.html` as described in
+link:{uri-hugo-doc-toc}[the Hugo documentation].
+
 If you want source code highlighting, take a look at
 link:{uri-tomorrow-pygments}[tomorrow-pygments].
 

layouts/_default/single.html

@@ -2,5 +2,7 @@
 <h1 class="post-title">{{ if .Draft }}DRAFT: {{ end }}{{ .Title }}</h1>
 {{ partial "post_meta.html" . }}
 
+{{ partial "toc.html" . }}
+
 <div class="content">{{ .Content }}</div>
 {{- end }}

layouts/partials/toc.html

@@ -0,0 +1 @@
+<!-- You can overwrite this partial to add a TOC. See <https://gohugo.io/content-management/toc>. -->