The "official" Dive Into Python links no longer go to the books. There is no great authoritative link to use since Mark Pilgrim left the internet, but these are returned high in Google results and appear to load really quickly.
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
* 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
* Update link
* Update link
* Replace Google C++ style guide link
* Update link
* Update link
* Fix link
* Update link
* Fix link
* Fix link
* Fix link
* Fix link
* Update link
* Fix link
* Fix link
* Update link
* Update link
* Fix link
* Update link
* Fix link
* Fix link
* Fix link
* Update link
* Update link
* Fix link
* Update link
* Fix link
* Fix link
* Update link
* Fix link
* Fix link
* Update link
* Fix link
* Fix link
* Fix link
* Fix link
* Fix link
* Fix link
* Fix link
* Fix link
* Update link
* Update link
* Update link
* Update link
* Update link
* Update link
* Update link
* Fix link
* Update link
* Fix link
* Update link
* Update link
* Fix link
* Fix link
* Fix link
* Update link
* Update link
* Replace link
* Fix link
* Update link
* Update link
* Update link
* Update link
* Update link
* Fix link
* Sort link
* Sort
* Update link
* Update link
* Update link
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* Update link
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* Update link
* Update link
* Update link
* Update link
* Fix lint warnings