Fix #13 + progress for #85

Conflicts:
	client/src/index.js
Fix #85
Add some videos

Conflicts:
	scripts/images/raw/ic1dX3kBQjGNaPQb8Xel_1920x1280.jpg
	scripts/images/raw/wdXqHcTwSTmLuKOGz92L_Landscape.jpg
Add VideoLinearPlayer
The twitter card link should use the video
Polish VideoLinearPlayer
Add loading state of the embed player