Podcast and course sources were added for Turkish and English content. (

EbookFoundation#6207)

* podcast and course sources were added for turkish and english content.

* alphabetic order for the course of Turkish.

* marking configuration were edited and it's valid for the project.

* stackoverflow podcast link was changed.

* turkish podcast link was changed. turkish course content order was changed. html-css section merged. the name of two section changed as ide-editor and version control systems.

* trendyol podcast link changed.

* removing trailing slash of the trendyol podcast link.

casts/free-podcasts-screencasts-en.md

@@ -270,6 +270,7 @@
 * [The Path to Performance](https://pathtoperf.com) (podcast)
 * [The Podcast from DZone.com: "For Developers, by Developers"](https://soundcloud.com/john-esposito-23072673) (podcast)
 * [The Silver Bullet Security Podcast with Gary McGraw](http://www.computer.org/web/computingnow/silverbullet) (podcast)
+* [The Stack Overflow Podcast](https://stackoverflow.blog/podcast/) (podcast)
 * [The Web Ahead](http://5by5.tv/webahead) (podcast)
 * [The Web Platform](http://thewebplatform.libsyn.com) (podcast)
 * [Thinking with Tanay](https://anchor.fm/tanaypratap) (podcast)

casts/free-podcasts-screencasts-tr.md

@@ -9,6 +9,7 @@
 * [codefiction](https://codefiction.tech) (podcast)
 * [devPod](https://devpod.org) (screencast)
 * [kodpod](https://kodpod.live) (podcast)
+* [Trendyol Tech Podcasts](https://trendyol.simplecast.com) (podcast)
 
 
 ### JavaScript

courses/free-courses-tr.md

@@ -1,25 +1,36 @@
 ### Index
 
 * [Algoritmalar](#algoritmalar)
-* [CSS](#css)
+* [HTML / CSS](#html--css)
+* [IDE / Editors](#ide--editors)
 * [JavaScript](#javascript)
 * [Python](#python)
 * [Temel programlama](#temel-programlama)
+* [Version Control Systems](#version-control-systems)
 
 
 ### Algoritmalar
 
 * [Algoritmalara giriş](https://acikders.tuba.gov.tr/course/view.php?id=133) - Charles Leiserson / Erik Demaine (Çev. Ali Yazıcı - Haluk Ar)
 
 
-### CSS
+### HTML / CSS
 
+* [Bootstrap Eğitim Serisi](https://youtube.com/playlist?list=PLGrTHqyRDvx5ZUs7h8mfGACFpnVipTNkA) - Hakan Yalçınkaya | Kodluyoruz
+* [CSS Eğitim Serisi](https://youtube.com/playlist?list=PLGrTHqyRDvx501K3-IMgS1fz-KfEB37gM) - Hakan Yalçınkaya | Kodluyoruz
+* [HTML Eğitim Serisi](https://youtube.com/playlist?list=PLGrTHqyRDvx7aP99nDNRKDi70bLFr_kX-) - Hakan Yalçınkaya | Kodluyoruz
 * [Sıfırdan CSS Eğitim](https://www.youtube.com/playlist?list=PLadt0EaV4m3BX9JaZbKS9B8076bruv93Y) - Adem Ilter
 
 
+### IDE / Editors
+
+* [Visual Studio Code Eğitim Serisi](https://youtube.com/playlist?list=PLGrTHqyRDvx72uHNQ6aZXxa1pSKViqIhE) - Hakan Yalçınkaya | Kodluyoruz
+
+
 ### JavaScript
 
 * [JavaScript Dersleri](https://javascript.sitesi.web.tr) - Murat Eliçalişkan
+* [JavaScript Eğitim Serisi](https://youtube.com/playlist?list=PLGrTHqyRDvx6PqKkqSPwph57HNN4RWgR2) - Hakan Yalçınkaya | Kodluyoruz
 
 
 ### Python
@@ -34,3 +45,9 @@
 * [Programlama ve programlama dillerinin temelleri](https://chrisstephenson.org/moodle/course/view.php?id=8) - Chris Stephenson
 
 
+### Version Control Systems
+
+* [Git Giriş Eğitim Serisi](https://youtube.com/playlist?list=PLGrTHqyRDvx4WAg9LPX_GKk7cKF7KBXOg) - Hakan Yalçınkaya | Kodluyoruz
+* [Git İleri Eğitim Serisi](https://youtube.com/playlist?list=PLGrTHqyRDvx6PVwxJmcQ0Veg1uoXRxQY8) - Kodluyoruz
+
+