* You Don't Know JS in potuguese.

You Don't Know JS in potuguese.

* Update free-programming-books-pt_BR.md

* Add index entry for agnostic operating systems topic

* Add Maziero's operating systems book

* Add under construction indicator

This book is an on going work, it's publish under that link, but things
are changed from time to time in it.

* Update free-programming-books-zh.md

* Update free-programming-books-zh.md

* Added fastai course in the Deep Learning list

* Added fastai course in the Deep Learning list

* Adding some Golang PT-BR free courses

* Fixing Alphabetical Order

Co-authored-by: NMarcel Nakamine <marcel.nakamine@euvo.com.br>

* Fix 'Reinforcement learning' broken link

Change the old google drive link to the new finished draft for the Reinforcement learning book

* Change url form

* Add three CC-BY-SA licensed, Ada's PDF resources

* Update free-programming-books.md

* Added more books

* Updated index

* Changed spacing and headings

* add Mobile People Talks Podcast

* add Mobile People Talks Podcast
Co-authored-by: NAleksandr_Denisov <aleksandr_denisov@epam.com>

* -_-

* add refactoring

* add refactoring
Co-authored-by: Nrndd <you@example.com>

* added estonian free programming books

* fixed issues

* fixed space issue

* added extra line to end, replace 'ja' with ','

* fixed alphabetical order

* Replaced broken link

The previous link outputs a 404 error.

* Fix alphabetical order

* Remove newline

* Update free-programming-books-fa_IR.md

* Update free-programming-books-fa_IR.md

* Update free-programming-books-fa_IR.md

* Adding Python course in pt-br

Adding Python course in pt-br

* Removing trailing slash

Removing trailing slash

* Update free-courses-ru.md

* Update free-courses-ru.md

* Add Java Web Scraping handbook

* Remove trailing '/' on Java Web Scraping handbook

* Added 苦しんで覚えるＣ言語 in ree-programming-books-ja.

* Sort in dictionary order

Written by Massimiliano Tarquini and Alessandro Ligi

* remove defunct links

* Update free-programming-books.md

Adding Node.js book reference

* Update free-programming-playgrounds.md

Added codesandbox.io under React (and removed the react reference from its listing on JavaScript).
Added a Java section and linked to repl.it
repl.it actually has sandboxes for most of the languages listed here, and maybe some others, but I didn't add them all in. The Swing support for Java is new, and has some bugs. They didn't respond to my report, so I think they are spread a little thin.

* add spaces to satisfy linter

* add space to satisfy linter
Co-authored-by: NEric Hellman <eric@hellman.net>

The textbook written for the course on python is freely licensed ([CC-BY-NC-ND](https://creativecommons.org/licenses/by-nc-nd/4.0/)), so it seems worth being added.