Added .column-content in order for site pages to use new alert rules
and bump icon up 1px so it looks more centered vertically

Created new class to hook into around featured 3 tiles so that only get larger icons. "see all" lists shouldn't have the larger icon. Refactored scss
Change parent classes of rule so correct heading sizes would be set in all instances (currently broken when member form is in error state.
Also moved app-list rule from core to applications partial
Reworked applications/index.html to use .sidebar class so it's consistent with applications/show and moved section#app-cartridges to wrap entire area so rules would be applied consistently.
After dicussing with Jordan, I reworked markup so that app-list and app-cartridges are only wrapping "main" column. Then change scss to style appropriately.