Mixins, Settings, Content collapse, slideshow

Mixins:
-gradients
-blur
-transition
-opacity
- (deletes border radius)
- (deletes box shadow)

Settings:
- adds a few global variables
- instructions on opacity fade
- adds index

Content Collapse:
- makes new module component less file

Slideshow
- adds SVG arrows

Content Collapse:
- adds SVG plus / minus