Update Small homepage and More menu

Create a like-for-like experience on the homepage across devices.

Update small home hero to match medium-up displays, add upcoming content
below choice links.

Set more menu (and homepage section that mimics it) to a tighter
style, for less scrolling.

Changes to be committed:
modified:   _includes/more.html
modified:   _layouts/default.html
new file:   images/home/easter-small.jpg
new file:   images/home/easter-small@2x.jpg
modified:   images/home/home-bg-small.jpg
modified:   images/home/home-bg-small@2x.jpg
new file:   images/home/next-week-small.jpg
new file:   images/home/next-week-small@2x.jpg
modified:   index.html
modified:   scss/design/_more.scss
modified:   scss/pages/_home.scss
modified:   stylesheets/app.css