Add default TOC template.

README.adoc

@@ -41,10 +41,14 @@ 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].
 
+== Good to know
+
+Table of contents are only written when the word count exceeds 400 and the `toc`
+field in your content’s front matter is set to true. See
+link:{uri-hugo-doc-toc}[the Hugo documentation] for details. You can overwrite
+the template by adding the file `layouts/partials/toc.html` to your blog.
+
 include::{uri-base}/raw/branch/main/CONTRIBUTING.adoc[]

layouts/partials/toc.html

@@ -1 +1,8 @@
-<!-- You can overwrite this partial to add a TOC. See <https://gohugo.io/content-management/toc>. -->
+{{ if and (gt .WordCount 400 ) (.Params.toc) }}
+<aside class="toc">
+  <header>
+    <h2>Table of contents</h2>
+    </header>
+    {{.TableOfContents}}
+</aside>
+{{ end }}

static/assets/nocolor.css

@@ -129,12 +129,6 @@ div.admonitionblock td
     margin-top: 2em;
 }
 
-/* Table of contents */
-#toc ul
-{
-    margin-top: 0;
-}
-
 textarea, pre
 {
     overflow: auto;