* Replaced broken link

The previous link outputs a 404 error.

* Fix alphabetical order

* Remove newline

Some of our Udacity listings added '(Udacity)' as and access note. This PR makes the practice uniform. We can consider other platforms case by case. In general, I feel that when the platform offers additional services that make it matter what platform a course is on, the addition of an access note is useful.

Comments welcome on appropriateness of  the access notes.

* New AI course

* New Finnish AI course

* Elements of AI course in German

* Trailing slash fix

* Trailing slash fix

* Added Intro to Machine Learning course by Udacity

* Changed ordering of courses in Machine Learning section

* add udacity note

* updating Microsoft's python course link

* fix link

* Update free-courses-en.md

* Update free-courses-en.md

* 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)

This reverts commit 4a9f06b4.

* added free react and grapQL courses

* updated the link to react course

* added required spacing

* Update deprecated links to Google's Android courses

* Renaming link to codelab in alphabetical order

* Rearrange in alphabetical order

* Remove Android Developer Fundamentals from books

* Add Android Developer Fundamentals to courses list

Course is depreciated

* Add Intro to JavaScript ES6 programming

* fix lint

* fix lint

* fix introducing to es6 to playlist link

* add GitHowTo

* fix lint

Pattern Recognition and Machine Learning Book Added from Microsoft

* Added  Edx Machine Learning course by Microsoft

* Added Edx Machine Learning course by Microsoft

* Update free-courses-en.md

* Update free-courses-en.md

* delint

* added Solidity

* added Solidity

* added Solidity

* bitcoin book added

* fixed ordering on bitcoin book entry

* added authors for bitcoin and solidity books

* added Bitcoin and cryptocurrency Princeton book

* mooc.fi Java courses added

* Added Git and Github course

* Ordering the list alphabetically

* Add Swift Vapor resources

* Reorder Vapor resources alphabetically

* Add author to Vapor 3 tutorial

* Move vapor university to free-courses-en.md

* Update free-courses-en.md

Added C++ courses on edX.org

* Update free-courses-en.md

Corrected alphabetical order.