Added missing spaces
Replaced "play run" command with "activator run"

The play command has been replaced by the activator toolchain since play 2.3.
Added footer link to github repos below portfolio
Fixed button hover effect not showing background animation
Readjusted subnavigation styling (applied content-width mixin)
Revisited jquery animate sample code
Enabled subnavigation scroll animation
Prevent subnavigation click event default but still update the url
Implemented basic subnavigation highlighting on scroll