chore: aligned docs to the template file for articles

knowledge base/duperemove.md

@@ -10,6 +10,12 @@ When given the `-d` option, `duperemove` also submits duplicated extents for ded
 
 `duperemove` can also take input from `fdupes`, given the `--fdupes` option.
 
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
 ## TL;DR
 
 ```sh
@@ -35,12 +41,27 @@ duperemove -Adhr --hashfile=path/to/hashfile \
   path/to/directory
 ```
 
-## Sources
+## Further readings
 
 - [Website]
-- [cheat.sh]
 - [manpage]
 
-[cheat.sh]: https://cheat.sh/duperemove
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- [cheat.sh]
+
+<!--
+  References
+  -->
+
+<!-- Upstream -->
 [manpage]: https://markfasheh.github.io/duperemove/duperemove.html
 [website]: https://markfasheh.github.io/duperemove/
+
+<!-- In-article sections -->
+[further readings]: #further-readings
+
+<!-- Others -->
+[cheat.sh]: https://cheat.sh/duperemove