reorganize files (#5199)

* reorganize files

1. make it easier to find files
2. reduce scrolling to get to README on main view of repo

* remove tr.txt again

courses/free-courses-tr.md

@@ -0,0 +1,30 @@
+### Index
+
+* [Algoritmalar](#algoritmalar)
+* [CSS](#css)
+* [JavaScript](#javascript)
+* [Temel programlama](#temel-programlama)
+
+
+### Algoritmalar
+
+* [Algoritmalara giriş](https://acikders.tuba.gov.tr/course/view.php?id=133) - Charles Leiserson / Erik Demaine (Çev. Ali Yazıcı - Haluk Ar)
+
+
+### CSS
+
+* [Sıfırdan CSS Eğitim](https://www.youtube.com/playlist?list=PLadt0EaV4m3BX9JaZbKS9B8076bruv93Y) - Adem Ilter
+
+
+### JavaScript
+
+* [JavaScript Dersleri](https://javascript.sitesi.web.tr) - Murat Eliçalişkan
+
+
+### Temel programlama
+
+* [Bilgisayar programlama I](https://acikders.ankara.edu.tr/course/view.php?id=8750) - Semra Gündüç
+* [Bilgisayar programlama II](https://acikders.ankara.edu.tr/course/view.php?id=8756) - Semra Gündüç
+* [Programlama ve programlama dillerinin temelleri](https://chrisstephenson.org/moodle/course/view.php?id=8) - Chris Stephenson
+
+