* 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.

* 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

* Added Turkish Podcast with free-podcasts-screencasts-tr.md

* added some turkish podcasts to free-podcasts-screencasts-tr.md

* put list alphabetically

* put list alphabetically last time

* trailing slashes
Co-authored-by: NEric Hellman <eric@hellman.net>