* Remove dead link from free-programming-books-tr.md
* Change Django heading to same size as other headings
* Update dead links
* revert django heading level
django is a subheading because it's a Python framework - see the outline, and note the alphabetization.
* Update DirectX programming link
* Fix add-on development in Blender link
* Fix GTK+ link
* Update .NET regex link
* Update link
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* Replace Google C++ style guide link
* Update link
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* Replace link
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* Fix lint warnings
* Added the React.js Succinctly.
* Update free-programming-books.md
* Included the Flutter, Azure Functions and Elixir Succinctly.
* Added two more books under flutter.
* Updated PHP courses
Removed:
Ultimate PHP Basics for Absolute Beginners - no longer free
Added:
beginners course PHP Programming Language Tutorial - Full Course and more advanced course Laravel 5.8 Tutorial From Scratch
* PHP Courses added
Corrected order
* Added PHP courses
Two PHP courses added and one removed (no longer free)
* Update free-programming-books-cs.md
a new book added
* Update free-programming-books-cs.md
* A link to a book changed
Exchanging a link for a new (more direct) one.