Change Angular Course in videos, add it to courses

- Updated angularcourse.com in the videos section (updated title and description).
- Added angularcourse.com to courses section.
Update README.md
Merge pull request #207 from gordonmzhu/master

Change Angular Course in videos, add it to courses
Merge pull request #208 from pyprism/patch-1

Update README.md
Update README.md

Removed the Angular Course link from Videos, so it only appears in Courses (had originally planned to remove the Course link and leave it in Videos, but decided it fit better under Courses)