Merge pull request #96 from Shopify/nav-accessibility

Nav accessibility
Less specific header class declaration
Reordered footer elements to include a quick link section
Merge pull request #97 from Shopify/footer-settings

Reordered footer elements to include a quick link section
Added empty Home Page settings area
Added within collection link to search. Removed unused var in col list item
Merge pull request #98 from Shopify/current-collection-link

Added within collection link to search
JS for navigation keyboard accessibility