fix: homogenize markdown across files using markdownlint rules (#6988)

* chore: homogenize C# table of content anchor (`#c-sharp` to `#csharp`)

* format: homogenize c# category title

right markdown escape instead of use HTML entities

* lint: fix `MD012/no-multiple-blanks` rule

Multiple consecutive blank lines [Expected: 2; Actual: 3]

* lint: fix `MD039/no-space-in-links`

Spaces inside link text

* lint: fix `MD009/no-trailing-spaces` rule

Trailing spaces [Expected: 0 or 4; Actual: 1]
Trailing spaces [Expected: 0 or 4; Actual: 2]

* lint: fix `MD006/ul-start-left` rule

* format: remove extra spaces between note tokens

* spell: fix lint `MD044/proper-names` rule

- HTML
- JavaScript
- YouTube

* spell: normalize to the most common `Index` heading

* lint: fix `MD007/ul-indent` rule

Unordered list indentation [Expected: 4; Actual: 2]

* format: escape pipes `|` from resources text

addresses #5176

* add Hesham Asem courses about machine and deep learning and nlp

* Expand the name of nlp section

* Change the order

* Revert "spell: normalize to the most common `Index` heading"

This reverts commit 4d6a74e7d7.

Co-authored-by: AhmedElTabarani <eltabaraniahmed@gmail.com>

courses/free-courses-ar.md

@@ -12,8 +12,8 @@
 * [Computer Architecture](#computer-architecture)
 * [Dart](#dart)
 * [Databases](#databases)
-  * [NoSQL](#nosql)
-  * [SQL](#sql)
+    * [NoSQL](#nosql)
+    * [SQL](#sql)
 * [Deep Learning](#deep-learning)
 * [Flutter](#flutter)
 * [Game Development](#game-development)
@@ -21,12 +21,12 @@
 * [HTML and CSS](#html-and-css)
 * [Java](#java)
 * [JavaScript](#javascript)
-  * [Gulp.js](#gulpjs)
-  * [jQuery](#jquery)
-  * [NodeJS](#nodejs)
-  * [PugJs](#pugjs)
-  * [React.js](#reactjs)
-  * [Vue.js](#vuejs)
+    * [Gulp.js](#gulpjs)
+    * [jQuery](#jquery)
+    * [NodeJS](#nodejs)
+    * [PugJs](#pugjs)
+    * [React.js](#reactjs)
+    * [Vue.js](#vuejs)
 * [Machine Learning](#machine-learning)
 * [Natural Language Programming](#natural-language-programming)
 * [.NET](#net)
@@ -34,12 +34,12 @@
 * [PHP](#php)
 * [Prolog](#prolog)
 * [Python](#python)
-  * [Django](#django)
-  * [Flask](#flask)
+    * [Django](#django)
+    * [Flask](#flask)
 * [R](#r)
 * [Software Architecture](#software-architecture)
 * [TypeScript](#typescript)
-  * [Angular](#angular)
+    * [Angular](#angular)
 
 
 ### Algorithms & Data Structures
@@ -191,7 +191,7 @@
 * [Learn SASS In Arabic 2021‏](https://www.youtube.com/playlist?list=PLDoPjvoNmBAzlpyFHOaB3b-eubmF0TAV2) - Elzero Web School
 * [Sass‏](https://www.youtube.com/playlist?list=PLDoPjvoNmBAz6bF7qObm2a1mLN_WHAWQo) - Elzero Web School
 * [Sass - Create a website‏](https://www.youtube.com/playlist?list=PLDoPjvoNmBAz9sluuyOWPifXvySgrGma8) - Elzero Web School
-* [Yonisfy CS94's | Web Programming with JavaScript‏](https://www.youtube.com/playlist?list=PLLWuK602vNiXqkUqcoKrVjCyOrZh7Tw0e) - Mohammed Elzanaty
+* [Yonisfy CS94's \| Web Programming with JavaScript‏](https://www.youtube.com/playlist?list=PLLWuK602vNiXqkUqcoKrVjCyOrZh7Tw0e) - Mohammed Elzanaty
 
 
 ### Java