Fixed broken course link (#5794)

Author: Nandan-18

Diff for: courses/free-courses-en.md

@@ -701,7 +701,7 @@
 
 #### Django
 
-* [Django for Everybody](https://dj4e.sites.uofmhosting.net/lessons) (Coursera Reading Materials with YouTube Videos)
+* [Django for Everybody](https://www.dj4e.com) - Charles R. Severence
 * [Django Tutorial for Beginners](https://www.youtube.com/playlist?list=PLsyeobzWxl7r2ukVgTqIQcl-1T0C2mzau) - Navin Reddy
 * [Django Tutorials](https://www.youtube.com/playlist?list=PL-osiE80TeTtoQCKZ03TU5fNfx2UY6U4p) - Corey Schafer
 * [Python Django Tutorial 2018 for Beginners](https://www.youtube.com/playlist?list=PL-J2q3Ga50oOpni_xS2PPUe4mf9lM96dD) - Clever Programmer