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

books/free-programming-books-az.md

@@ -0,0 +1,38 @@
+### Index
+
+* [C](#c)
+* [CSS](#css)
+* [HTML](#html)
+* [JavaScript](#javascript)
+* [Linux](#Linux)
+* [PHP](#php)
+
+
+### C
+
+* [C Proqramlaşdırma Dili](http://ilkaddimlar.com/ders/c-proqramlasdirma-dili)
+
+
+### CSS
+
+* [CSS](http://ilkaddimlar.com/ders/css)
+
+
+### HTML
+
+* [HTML](http://ilkaddimlar.com/ders/html)
+
+
+### JavaScript
+
+* [JavaScript](http://ilkaddimlar.com/ders/javascript)
+
+
+### Linux
+
+* [Linux](http://ilkaddimlar.com/ders/linux)
+
+
+### PHP
+
+* [PHP](http://ilkaddimlar.com/ders/php)