* ADD cheetsheet: Pandas Data Wrangling

Add the official Python Pandas Data Wrangling cheetsheet
Source: https://pandas.pydata.org/Pandas_Cheat_Sheet.pdf
Scrapped from: https://pandas.pydata.org/getting_started.html

* ADD cheetsheet: Data Wrangling with pandas

Fix CI- CD error: Alfabetical order

* Add jstrieb/sytems-programming-cheat-sheet

* Swap alphabetical order ("the" matters)

* Add Django ebook and Brazilian Interactive Tutorials page

* Code refactoring

* Add author name and access note

* Reorder README 'Interactive Programming Resources' section

* Added Golang course.

* Added a link for the Chinese courses in the readme.

* Removed old free courses-zh_cn.

* Added new interactive tutorials.

* Added extra line.

* Updated file path.

* Updated file path.

* alphabetize added language courses

Our linter had not been looking at these languages

* fix books files

* casts and more

* Added the Artificial Intelligence section

* Added an empty line on top

* Added more empty lines!

* 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