update - images

> new final images
edit - markup for scroll block

> Put all scroll content inside <main>
> Use .container rather than main for centring
add - scroll indicators and scroll to

> add waypoints.js setup
> add scroll to clicks
edit - css for scroll blocks and scroll indicators

> remove main rules and leave .container
> rejig artists layout odd/even puesdo
> add $yellow variable [that needs final value]
> add active scroll indication