Add several Malayalam courses authored by `Yes Tech Media`, `Tintu Vlogger` and `Brototype Malayalam` (#6994)

* Update free-courses-ml.md

* Expand title of `bash/shell` section and fix its fragment id to get right cross linking.

* Move `Bootstrap` as subsection of `HTML/CSS` (like in other listings)

* Move `Bootstrap` as subsection of `HTML/CSS` (like in other listings)

* Escape pipes on Markdown

See #5176 for a reason

* Fix `node.js` title like in other listings and alphabetize Node-React sections

* Update free-courses-ml.md

* Fix TOC entry fragment of `HTML / CSS`

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-ml.md

@@ -1,10 +1,22 @@
 ### Index
 
 * [Android](#android)
+* [Bash and Shell](#bash-and-shell)
+* [C](#c)
+* [C++](#cpp)
+* [Data Structure](#data-structure)
+* [Flutter](#flutter)
+* [Git](#git)
+* [HTML and CSS](#html-and-css)
+    * [Bootstrap](#bootstrap)
+* [Java](#java)
 * [JavaScript](#javascript)
+    * [Node.js](#nodejs)
+    * [React](#react)
 * [PHP](#php)
 * [Python](#python)
     * [Django](#django)
+    * [Flask](#flask)
 
 
 ### Android
@@ -12,22 +24,90 @@
 * [Android App Development Tutorial Malayalam](https://youtube.com/playlist?list=PLZ78Q1BKkdA1-eMVQOiBiMtQQb_vYWnvV) - Sabith Pkc Mnr
 
 
+### Bash and Shell
+
+* [Bash Shell Scripting Malayalam Tutorial](https://youtube.com/playlist?list=PL1JrLEBAapUUcV6LES8bTEHJAOlkhmOHO) - Yes Tech Media
+
+
+### C
+
+* [C programming malayalam tutorial](https://youtube.com/playlist?list=PL1JrLEBAapUXh0dSzCk3dvQtGmjT9fBBj) - Yes Tech Media
+* [C programming for beginners in malayalam quarantine learning programming malayalam](https://youtube.com/playlist?list=PLBKJGko2JEdEVpp5vyyfKYdv3r2GC777i) - Tintu Vlogger
+
+
+### <a id="cpp"></a>C++
+
+* [C++ Malayalam Tutorial Full](https://youtube.com/playlist?list=PL1JrLEBAapUXVcHV3rO-g-N4gBHcBe2c-) - Yes Tech Media
+
+
+### Data Structure
+
+* [Data Structure Challenge](https://youtube.com/playlist?list=PLY-ecO2csVHc5kajCd3fHU6MhkTABkRh9) - Brototype Malayalam
+
+
+### Flutter
+
+* [Flutter Malayalam Tutorial Series](https://youtube.com/playlist?list=PLY-ecO2csVHcUlBVvIMAa3dbja12TFJiN) - Brototype Malayalam
+
+
+### Git
+
+* [Git Tutorial Malayalam \| Best Malayalam Git Tutorial \| Date With Git](https://youtube.com/playlist?list=PLY-ecO2csVHdLhAO6TERaMJXP8aqyWVt-) - Brototype Malayalam
+
+
+### HTML and CSS
+
+* [CSS Malayalam Tutorial Full Course](https://youtube.com/playlist?list=PL1JrLEBAapUVvE-oCkKD5QhGG8nb0hhZk) - Yes Tech Media
+* [HTML Tutorial Malayalam Full](https://youtube.com/playlist?list=PL1JrLEBAapUVyMVQp6SmpytH1HPeCiNPH) - Yes Tech Media
+
+
+#### Bootstrap
+
+* [BOOTSTRAP Malayalam Tutorial](https://youtube.com/playlist?list=PL1JrLEBAapUWqs_HbcYngAOmpPbiccqNy) - Yes Tech Media
+
+
+### Java
+
+* [Java Programming Malayalam Tutorial](https://youtube.com/playlist?list=PL1JrLEBAapUXndScHzvMaSVOspebvFOsH) - Yes Tech Media
+
+
 ### JavaScript
 
 * [JavaScript Malayalam Tutorial](https://www.youtube.com/watch?v=3mjwtu4_0uk) - Yes Tech Media
+* [javascript tutorial in malayalam](https://youtube.com/playlist?list=PLBKJGko2JEdF4irCbI5BdHIEfxEdfMNqA) - Tintu Vlogger
+
+
+#### Node.js
+
+* [Node.js Malayalam Tutorial](https://youtube.com/playlist?list=PL1JrLEBAapUUKTpfCPV5Qirq-psQwY0Qq) - Yes Tech Media
+* [Node js malayalam free course](https://youtube.com/playlist?list=PLBKJGko2JEdHNBid0azo2vDTi6Vx9p63h) - Tintu Vlogger
+
+
+#### React
+
+* [React js malayalam tutorial](https://youtube.com/playlist?list=PLBKJGko2JEdG8FUKu2hUF6K7irvbT8hIM) - Tintu Vlogger
+* [React Challenge](https://youtube.com/playlist?list=PLY-ecO2csVHfgVM9sChmUirqK7BXUBX9P) - Brototype Malayalam
+* [React JS - Malayalam Tutorial - by Yes Tech Media](https://youtube.com/playlist?list=PL1JrLEBAapUX44d5zzl0hf7vX7caSCidT) - Yes Tech Media
 
 
 ### PHP
 
 * [PHP Programming Malayalam Tutorial for Beginners](https://www.youtube.com/watch?v=nFYWCouZ1UA) - Yes Tech Media
+* [php tutorial in malayalam](https://youtube.com/playlist?list=PLBKJGko2JEdH_T2ki6ty4xGV19qB7Hpmm) - Tintu Vlogger
 
 
 ### Python
 
 * [Python Programming Malayalam Tutorial](https://www.youtube.com/watch?v=ihnWXGPxNEk) - Yes Tech Media
+* [Python Tutorial Malayalam \| Best Malayalam Python Programming Tutorial](https://youtube.com/playlist?list=PLY-ecO2csVHfbpOmWamlb8Mujjdnl1jks) - Brototype Malayalam 
 
 
 #### Django
 
 * [Python Django malayalam tutorial](https://www.youtube.com/watch?v=Obu5qj9sdaE) - Tintu Vlogger
 * [Python Django Tutorial for Beginners in malayalam](https://www.youtube.com/playlist?list=PLbasZIkCgHJGXEjcatJ3aO1NpS2PsOtoQ) - Code Band
+
+
+#### Flask
+
+* [Python Flask Malayalam Tutorial](https://youtube.com/playlist?list=PL1JrLEBAapUU-HCC1f5x8YiGEMoZdGl0e) - Yes Tech Media