Added Deep Learning with PyTorch course in free-courses-en.md (#5742)

* Update 1 book URL in free-programming-books-id.md

Update URL for Pemrograman Kompetitif Dasar

* Add new MongoDB book at free-programming-books-langs.md

Added MongoDB Notes for Professionals

* Added Git for Professionals Tutorial at free-courses-en.md

Git for Professionals Tutorial - Tools & Concepts for Mastering Version Control with Git

* Added Git & GitHub tutorial playlist at free-courses-en.md

* Adding credit to the instructor

* Added Deep Learning with PyTorch course in free-courses-en.md

* Set theme jekyll-theme-cayman

* Revert "Set theme jekyll-theme-cayman"

This reverts commit 1287e0bb4a.

courses/free-courses-en.md

@@ -264,6 +264,7 @@
 * [Convolutional Neural Networks for Visual Recognition](http://cs231n.github.io)
 * [Deep Learning for Natural Language Processing](http://cs224d.stanford.edu)
 * [Deep Learning Specialization](https://www.coursera.org/specializations/deep-learning) (coursera)
+* [Deep Learning with PyTorch](https://www.youtube.com/playlist?list=PLWKjhJtqVAbm3T2Eq1_KgloC7ogdXxdRa) - Aakash N. S., freeCodeCamp.org (YouTube)
 * [Deep Multi-Task and Meta Learning](https://cs330.stanford.edu) - Chelsea Finn (Stanford University)
 * [Deep Reinforcement Learning](http://rail.eecs.berkeley.edu/deeprlcourse/) - Sergey Levine
 * [Exploring Fairness in Machine Learning for International Development](https://ocw.mit.edu/resources/res-ec-001-exploring-fairness-in-machine-learning-for-international-development-spring-2020) - Dr. Richard Fletcher, Prof. Daniel Frey, Dr. Mike Teodorescu, Amit Gandhi, Audace Nakeshimana (MIT OpenCourseWare)