* #4966 Add new JS tutorial

* Remove (youtube) and add list URL

* Add 10 Keys to Great Landing Pages

* Add PDF Indication

* Add and fix CP resources, check_urls=problem-sets-competitive-programming.md

* Remove tech delight link since not CP

* Add TRPL(The Book), check_urls=free-programming-books-ko.md

* Add The Rust Programming Language.
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* Fix Lint Rust, check_urls=free-programming-books-ko.md

* Add Author, check_urls=free-programming-books-ko.md

* Add Format, check_urls=free-programming-books-ko.md

* Add networking section and resources

* Add a security book

* Create Open Source Ecosystem section and add new/exist links

* Add garbage collection section

* Adds the 'JavaScript Testing Fundamentals' course

Adds the free 'JavaScript Testing Fundamentals' course on JavaScript testing from https://vueschool.io

* Fix build issue.

* Fix alphabetization

* Migrates the JavaScript Testing Course to Vue.js 

Migrates the JavaScript Testing Course to Vue.js as the course uses Vue.js as a base for the testing course.

* Add Lua, MATLAB, and Ruby courses, check_urls=free-courses-en.md

* Fix alphabetical ordering of Lua course

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

* Fix alphabetical ordering

* Update free-courses-hi.md

Added some more C++/Java Playlists.

* Update free-courses-hi.md

Changed the titles to original ones.

* fix #3585

* Changed encoding back to UTF-8

* fix #3586

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

* fix 3558

* Add back linebreak.

* Fix 3556

* Tidy up free-courses-vi.md#c

* Fixes #3545

* Corrected TLD

Adds the free 'Vue.js Components Fundamentals' course on Vue.js from https://vueschool.io.

* Update free-courses-en.md

Added 4 more free courses for Android.

* Update free-courses-en.md

Added 4 free courses for Android

* Update free-courses-en.md

Added 10 courses on Android

* Update free-courses-en.md

Added 10 courses on Android

* Update free-courses-es.md

* Update free-programming-books-es.md

* Update free-courses-es.md

* Update free-programming-books-es.md

* Update free-podcasts-screencasts-es.md

* Update free-podcasts-screencasts-es.md

* Fix Slash

* Fix Slash

* Update free-podcasts-screencasts-es.md

* Update free-podcasts-screencasts-es.md

* Update free-podcasts-screencasts-es.md

* Update free-podcasts-screencasts-es.md

* Fix Slash for Correct Fail

* Update Rust Courses

Added Rust Courses which were good in quality on YouTube and beginner friendly.

* Update free-courses-en.md

Changed the order of resources.

* Update free-courses-en.md

Update

* Update free-courses-en.md

Removed a blank line. Lint problems fixed.

* Update free-courses-en.md

Update

* Update free-courses-en.md

Removed YouTube..

* Updated broken link

* Added author of the Mostly Adequate Guide to FP