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>

books/free-programming-books-fa_IR.md

@@ -8,9 +8,9 @@
 * [LaTeX](#latex)
 * [Linux](#linux)
 * [PHP](#php)
-  * [Symfony](#symfony)
+    * [Symfony](#symfony)
 * [Python](#python)
-  * [Django](#django)
+    * [Django](#django)
 * [R](#r)
 
 
@@ -83,4 +83,3 @@
 * [تحلیل شبکه‌های اجتماعی در R](http://cran.r-project.org/doc/contrib/Raeesi-SNA_in_R_in_Farsi.pdf) (PDF)
 * [راهنمای زبان R](http://cran.r-project.org/doc/contrib/Mousavi-R-lang_in_Farsi.pdf) (PDF)
 * [موضعات ویژه در R](http://cran.r-project.org/doc/contrib/Mousavi-R_topics_in_Farsi.pdf) (PDF)
-