Remove partial for performance purposes
modified:   app/views/activities/results.html.erb
Change on layout for category page and activity page
modified:   app/assets/stylesheets/list.scss
modified:   app/models/activity.rb
modified:   app/views/activities/_activities_sorted_list.html.erb
modified:   app/views/activities/show.html.erb
modified:   app/views/categories/about.html.erb
modified:   app/views/categories/show.html.erb
modified:   db/seeds.rb
modified:   lib/slug_mapping.rb