Fixed broken links for following books in C++ section:
* Hands-On System Programming with C++
* How to make an Operating System

Updated one of the URL's to a working one and removed a book which is no longer accessible (at least, couldn't find a legit source).

* #5204 Correct URL, and add direct PDF links to Competitive Programming books.

* Add author to Competitive Programming.

* 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

Removal of "Learn Python in Y Minutes" from free-programming-books.md and addition to free-programming-cheatsheets.md
Co-authored-by: NEric Hellman <eric@hellman.net>

* Added Pandas books.

* Added empty line.

* Removed a tutorial from programming books and added it into tutorials.

* Removed single-item category, put Pandas tutorial under python.

Updated the link for:
Free eBook - Hands-On Natural Language Processing with Python

* Add Free and Open Machine Learning book to free-programming-books.md

* used suggested URL
Co-authored-by: NEric Hellman <eric@hellman.net>

* Add HTTPS and JS resources, check_urls=free-programming-books.md free-courses-en.md

* moved http and https sections into networking
Co-authored-by: NEric Hellman <eric@hellman.net>

* game AI Pro

* typo

* Java Bilgisayar Diliyle Programlama

* powershell 101

* added 100 (and counting) Laravel Quick Tips

* not free

* How HTTPS works

added django 3.1 official documentation to free-programming-books.md

* Added a pdf book on fortran. The book has tons of programing topics and gets in to programing history.

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

- With 2 new books
- Shifted one existing book in Angular.js to Angular
- Removed a book: https://leanpub.com/practical-angular from Angular.js because it's a Paid book
- Deno is now included under TypeScript, like in the Index

* Add Single page apps in depth by Mixu

* try to fix formatting

* fix formatting

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

* Updated free-programming-books.md with DBMS books

Added DBMS books

* Update free-programming-books.md

* Update free-programming-books.md

* alphabetize

also removed the adjacent tutorialspoint title- only a preview
Co-authored-by: NEric Hellman <eric@hellman.net>

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

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

* Add Python Data Science, check_urls=free-programming-books.md

* Replace GitHub link with website

* Remove Duplicate LearnCpp.com

* Rename LearnCpp.com

* added machine learning free book for begineers

IBM machine learning for beginners

* Update free-programming-books.md

added authur name as suggested to machine learning book

* add nim books

* edit title per comment

* Added Git/Github book

* alphabetize

* resolve a conflict - resource moved to cheatsheets

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

* Added Web Almanac

Added Web Almanac to Web Development

* Added Web Almanac

Added Web Almanac to Misc Section

* Add 10 Keys to Great Landing Pages

* Add PDF Indication

* Add PHP and Ruby resources, check_urls=free-programming-books-id.md free-programming-books.md

* Fix alphabetical ordering

* fix #3585

* Changed encoding back to UTF-8

* fix #3586

* Changed encoding from UTF-8 BOM to UTF-8

* Updated broken link

* Added author of the Mostly Adequate Guide to FP