current ng-newsletter link results in a 500 page. found an alternate link, but I suspect it is temporary until the newsletter fixes their 500, so we may not want to update the link. either way, this PR addresses #3400
* Remove dead link from free-programming-books-tr.md
* Change Django heading to same size as other headings
* Update link for Learning Deep Architectures
* revert django heading
* undo space add
* Added the React.js Succinctly.
* Update free-programming-books.md
* Included the Flutter, Azure Functions and Elixir Succinctly.
* Added two more books under flutter.
* Update deprecated links to Google's Android courses
* Renaming link to codelab in alphabetical order
* Rearrange in alphabetical order
* Remove Android Developer Fundamentals from books
* Add Android Developer Fundamentals to courses list
* add introduction to Ada course book
* Change book to add
Add Ada for the C++ or Java Developer book instead.
* add author name to an ada book
* Update free-programming-books.md
* IPv6 for IPv4 Experts english has been added
* IPv6 for IPv4 Experts russian has been added
* IPv6 for IPv4 Experts russian URL change
* IPv6 for IPv4 Experts english URL change
* remove 2 ebook of [Linkers and Loaders], [Learn Python The Hard Way]. ref issue:#3091, #3062
* Fix Issue: #2993, Add book The Black Art of Programming.
* fix author name
* Add Ruby Tutorial For Beginners
Hi,
This adds a new free Ruby tutorial (HTML version), **optionally** visitors can download a PDF version of the book by entering an email address.
## What does this PR do?
Add Resource
### Description
Free Ruby tutorial / book for beginners in HTML format with multiple lessons, including installing Ruby, conditionals, loops & object-oriented programming.
### Why is this valuable
It's a complete Ruby tutorial for beginners that helps learn Ruby from scratch. Includes examples, clear explanations & exercises.
### How do we know it's really free?
I made it.
### For book lists, is it a book?
Yes.
### Checklist:
- [x] Not a duplicate
- [x] Included author(s) if appropriate
- [x] Lists are in alphabetical order
- [x] Needed indications added (PDF, access notes, under construction)
* Use Full Book Name
Charlotte Tan
Judah Lamm
Danielly Costa
Dzmitry Lahoda
Jason Novinger
Aayush Bisen
Karthikeyan A K
prabakaranr
Boro Sitnikovski
Øyvind
Maïeul Rouquette
zach valenta
Marvin Danig
cynic
nick bouldien
Collins Zimba
Kaleem Ullah
Ye Shu
Ryan D Holm
Momozor
Sumo99
Nicola Dall'Asen
Victor Λntonio
Jeeva Subburaj
Mikhail Vasilyev
umanovskis
Ramiro Gómez
zhongjiajie
Tiago Athayde
Patrick Cozzi
Sekito Lv
Desmond
Jesus Castello