chore: improved markdown article and syntax

knowledge base/markdown.md

@@ -1,5 +1,14 @@
 # Markdown
 
+ReadMe's Markdown engine.
+
+## Table of contents <!-- omit in toc -->
+
+1. [Troubleshooting](#troubleshooting)
+   1. [Escape the backtick character](#escape-the-backtick-character)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
 ## Troubleshooting
 
 ### Escape the backtick character
@@ -11,8 +20,26 @@ Render it in an inline code block using double backticks instead of single backt
 Alternatively, use a code block. This will wrap everything in a `<pre>` HTML tag.  
 To do this, either indent 4 spaces to start a code block, or use fenced code blocks if supported.
 
+## Further readings
+
+- Official [documentation]
+- [Linguist supported language syntax list]
+
 ## Sources
 
+All the references in the [further readings] section, plus the following:
+
+- [Escaping Backticks]
 - [Escaping backtick in Markdown]
 
+<!-- project's references -->
+
+<!-- internal references -->
+
+[documentation]: https://docs.readme.com/rdmd/docs
+
+<!-- external references -->
+
 [escaping backtick in markdown]: https://www.growingwiththeweb.com/2015/06/escaping-backtick-in-markdown.html
+[escaping backticks]: https://www.markdownguide.org/basic-syntax/#escaping-backticks
+[linguist supported language syntax list]: https://github.com/github/linguist/blob/master/lib/linguist/languages.yml