Initial AD port

themes/after-dark/docs/content/feature/table-of-contents.md

@@ -0,0 +1,21 @@
++++
+title = "Table of Contents"
+description = "Quickly locate information in longer posts."
+categories = ["navigation"]
+tags = ["metadata"]
+features = ["related content", "snippets", "code highlighter"]
+[[copyright]]
+  owner = "Josh Habdas"
+  date = "2019"
+  license = "agpl-3.0-or-later"
++++
+
+Automatically generate a table of contents with smooth-scroll links based on the current {{< external href="https://gsnedders.html5.org/outliner/" text="page outline" />}}. To do so add the following to post {{< external href="https://gohugo.io/content-management/front-matter/" text="Front Matter" />}}:
+
+```toml
+toc = true
+```
+
+Set `false`, or simply remove the setting, to disable.
+
+The table of contents will be collapsed under a disclosure on page load. Once the disclosure is expanded the full page outline will be revealed. Selecting an item in the outline will smooth-scroll to the corresponding section, update the browser history and highlight the section title.