Added Django for Everybody and Restructuring of Python topic (#4473)

* Added open source material of Django for Everybody Course

* Restructured Python and added django and flask sub headings

* Change django for everybody link to a direct link to lessons

* Added required line break

* Minor fix

free-courses-en.md

@@ -47,6 +47,8 @@
 * [Perl](#perl)
 * [PHP](#php)
 * [Python](#python)
+  * [Django](#django)
+  * [Flask](#flask)
 * [QB64](#QB64)
 * [R](#r)
 * [RethinkDB](#rethinkdb)
@@ -489,9 +491,6 @@
 * [Python Beginners-Intermediate Tutorial](https://www.youtube.com/playlist?list=PL-osiE80TeTt2d9bfVyTiXJA-UTHn6WwU) - Corey Schafer
 * [Python Course](http://www.python-course.eu)
 * [Python Course from scratch](https://scrimba.com/playlist/pNpZMAB) - Olaf Paulson (scrimba)
-* [Python Django Basics Tutorial](https://www.youtube.com/playlist?list=PL-osiE80TeTtoQCKZ03TU5fNfx2UY6U4p) - Corey Schafer
-* [Python Flask Framework Tutorial](https://www.youtube.com/playlist?list=PL-osiE80TeTs4UjLw5MM6OjgkjFeUxCYH) - Corey Schafer
-* [Python Flask Tutorial](https://www.tutorialspoint.com/flask/flask_overview.htm) (TutorialsPoint)
 * [Python for Everybody](https://www.py4e.com/lessons) (Coursera Reading Materials with YouTube Videos)
 * [Python Learn Course](https://www.kaggle.com/learn/python) - Colin Morris (Kaggle)
 * [Python Programming Tutorial](https://www.youtube.com/playlist?list=PL_RGaFnxSHWpX_byHyTEj9hecPngl2DqR)
@@ -500,6 +499,18 @@
 * [The Python Tutorial](https://docs.python.org/3/tutorial/)
 
 
+#### Django
+
+* [Django for Everybody](https://dj4e.sites.uofmhosting.net/lessons) (Coursera Reading Materials with YouTube Videos)
+* [Python Django Basics Tutorial](https://www.youtube.com/playlist?list=PL-osiE80TeTtoQCKZ03TU5fNfx2UY6U4p) - Corey Schafer
+
+
+#### Flask
+
+* [Python Flask Framework Tutorial](https://www.youtube.com/playlist?list=PL-osiE80TeTs4UjLw5MM6OjgkjFeUxCYH) - Corey Schafer
+* [Python Flask Tutorial](https://www.tutorialspoint.com/flask/flask_overview.htm) (TutorialsPoint)
+
+
 ### QB64
 
 * [Game Programming with QB64](http://qb64sourcecode.com) - Terry Ritchie